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JavaScript's functional programming helper library.
The newest version!
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define('underscore', factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, (function () {
var current = global._;
var exports = global._ = factory();
exports.noConflict = function () { global._ = current; return exports; };
}()));
}(this, (function () {
// Underscore.js 1.13.7
// https://underscorejs.org
// (c) 2009-2024 Jeremy Ashkenas, Julian Gonggrijp, and DocumentCloud and Investigative Reporters & Editors
// Underscore may be freely distributed under the MIT license.
// Current version.
var VERSION = '1.13.7';
// Establish the root object, `window` (`self`) in the browser, `global`
// on the server, or `this` in some virtual machines. We use `self`
// instead of `window` for `WebWorker` support.
var root = (typeof self == 'object' && self.self === self && self) ||
(typeof global == 'object' && global.global === global && global) ||
Function('return this')() ||
{};
// Save bytes in the minified (but not gzipped) version:
var ArrayProto = Array.prototype, ObjProto = Object.prototype;
var SymbolProto = typeof Symbol !== 'undefined' ? Symbol.prototype : null;
// Create quick reference variables for speed access to core prototypes.
var push = ArrayProto.push,
slice = ArrayProto.slice,
toString = ObjProto.toString,
hasOwnProperty = ObjProto.hasOwnProperty;
// Modern feature detection.
var supportsArrayBuffer = typeof ArrayBuffer !== 'undefined',
supportsDataView = typeof DataView !== 'undefined';
// All **ECMAScript 5+** native function implementations that we hope to use
// are declared here.
var nativeIsArray = Array.isArray,
nativeKeys = Object.keys,
nativeCreate = Object.create,
nativeIsView = supportsArrayBuffer && ArrayBuffer.isView;
// Create references to these builtin functions because we override them.
var _isNaN = isNaN,
_isFinite = isFinite;
// Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');
var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',
'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];
// The largest integer that can be represented exactly.
var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;
// Some functions take a variable number of arguments, or a few expected
// arguments at the beginning and then a variable number of values to operate
// on. This helper accumulates all remaining arguments past the function’s
// argument length (or an explicit `startIndex`), into an array that becomes
// the last argument. Similar to ES6’s "rest parameter".
function restArguments(func, startIndex) {
startIndex = startIndex == null ? func.length - 1 : +startIndex;
return function() {
var length = Math.max(arguments.length - startIndex, 0),
rest = Array(length),
index = 0;
for (; index < length; index++) {
rest[index] = arguments[index + startIndex];
}
switch (startIndex) {
case 0: return func.call(this, rest);
case 1: return func.call(this, arguments[0], rest);
case 2: return func.call(this, arguments[0], arguments[1], rest);
}
var args = Array(startIndex + 1);
for (index = 0; index < startIndex; index++) {
args[index] = arguments[index];
}
args[startIndex] = rest;
return func.apply(this, args);
};
}
// Is a given variable an object?
function isObject(obj) {
var type = typeof obj;
return type === 'function' || (type === 'object' && !!obj);
}
// Is a given value equal to null?
function isNull(obj) {
return obj === null;
}
// Is a given variable undefined?
function isUndefined(obj) {
return obj === void 0;
}
// Is a given value a boolean?
function isBoolean(obj) {
return obj === true || obj === false || toString.call(obj) === '[object Boolean]';
}
// Is a given value a DOM element?
function isElement(obj) {
return !!(obj && obj.nodeType === 1);
}
// Internal function for creating a `toString`-based type tester.
function tagTester(name) {
var tag = '[object ' + name + ']';
return function(obj) {
return toString.call(obj) === tag;
};
}
var isString = tagTester('String');
var isNumber = tagTester('Number');
var isDate = tagTester('Date');
var isRegExp = tagTester('RegExp');
var isError = tagTester('Error');
var isSymbol = tagTester('Symbol');
var isArrayBuffer = tagTester('ArrayBuffer');
var isFunction = tagTester('Function');
// Optimize `isFunction` if appropriate. Work around some `typeof` bugs in old
// v8, IE 11 (#1621), Safari 8 (#1929), and PhantomJS (#2236).
var nodelist = root.document && root.document.childNodes;
if (typeof /./ != 'function' && typeof Int8Array != 'object' && typeof nodelist != 'function') {
isFunction = function(obj) {
return typeof obj == 'function' || false;
};
}
var isFunction$1 = isFunction;
var hasObjectTag = tagTester('Object');
// In IE 10 - Edge 13, `DataView` has string tag `'[object Object]'`.
// In IE 11, the most common among them, this problem also applies to
// `Map`, `WeakMap` and `Set`.
// Also, there are cases where an application can override the native
// `DataView` object, in cases like that we can't use the constructor
// safely and should just rely on alternate `DataView` checks
var hasDataViewBug = (
supportsDataView && (!/\[native code\]/.test(String(DataView)) || hasObjectTag(new DataView(new ArrayBuffer(8))))
),
isIE11 = (typeof Map !== 'undefined' && hasObjectTag(new Map));
var isDataView = tagTester('DataView');
// In IE 10 - Edge 13, we need a different heuristic
// to determine whether an object is a `DataView`.
// Also, in cases where the native `DataView` is
// overridden we can't rely on the tag itself.
function alternateIsDataView(obj) {
return obj != null && isFunction$1(obj.getInt8) && isArrayBuffer(obj.buffer);
}
var isDataView$1 = (hasDataViewBug ? alternateIsDataView : isDataView);
// Is a given value an array?
// Delegates to ECMA5's native `Array.isArray`.
var isArray = nativeIsArray || tagTester('Array');
// Internal function to check whether `key` is an own property name of `obj`.
function has$1(obj, key) {
return obj != null && hasOwnProperty.call(obj, key);
}
var isArguments = tagTester('Arguments');
// Define a fallback version of the method in browsers (ahem, IE < 9), where
// there isn't any inspectable "Arguments" type.
(function() {
if (!isArguments(arguments)) {
isArguments = function(obj) {
return has$1(obj, 'callee');
};
}
}());
var isArguments$1 = isArguments;
// Is a given object a finite number?
function isFinite$1(obj) {
return !isSymbol(obj) && _isFinite(obj) && !isNaN(parseFloat(obj));
}
// Is the given value `NaN`?
function isNaN$1(obj) {
return isNumber(obj) && _isNaN(obj);
}
// Predicate-generating function. Often useful outside of Underscore.
function constant(value) {
return function() {
return value;
};
}
// Common internal logic for `isArrayLike` and `isBufferLike`.
function createSizePropertyCheck(getSizeProperty) {
return function(collection) {
var sizeProperty = getSizeProperty(collection);
return typeof sizeProperty == 'number' && sizeProperty >= 0 && sizeProperty <= MAX_ARRAY_INDEX;
}
}
// Internal helper to generate a function to obtain property `key` from `obj`.
function shallowProperty(key) {
return function(obj) {
return obj == null ? void 0 : obj[key];
};
}
// Internal helper to obtain the `byteLength` property of an object.
var getByteLength = shallowProperty('byteLength');
// Internal helper to determine whether we should spend extensive checks against
// `ArrayBuffer` et al.
var isBufferLike = createSizePropertyCheck(getByteLength);
// Is a given value a typed array?
var typedArrayPattern = /\[object ((I|Ui)nt(8|16|32)|Float(32|64)|Uint8Clamped|Big(I|Ui)nt64)Array\]/;
function isTypedArray(obj) {
// `ArrayBuffer.isView` is the most future-proof, so use it when available.
// Otherwise, fall back on the above regular expression.
return nativeIsView ? (nativeIsView(obj) && !isDataView$1(obj)) :
isBufferLike(obj) && typedArrayPattern.test(toString.call(obj));
}
var isTypedArray$1 = supportsArrayBuffer ? isTypedArray : constant(false);
// Internal helper to obtain the `length` property of an object.
var getLength = shallowProperty('length');
// Internal helper to create a simple lookup structure.
// `collectNonEnumProps` used to depend on `_.contains`, but this led to
// circular imports. `emulatedSet` is a one-off solution that only works for
// arrays of strings.
function emulatedSet(keys) {
var hash = {};
for (var l = keys.length, i = 0; i < l; ++i) hash[keys[i]] = true;
return {
contains: function(key) { return hash[key] === true; },
push: function(key) {
hash[key] = true;
return keys.push(key);
}
};
}
// Internal helper. Checks `keys` for the presence of keys in IE < 9 that won't
// be iterated by `for key in ...` and thus missed. Extends `keys` in place if
// needed.
function collectNonEnumProps(obj, keys) {
keys = emulatedSet(keys);
var nonEnumIdx = nonEnumerableProps.length;
var constructor = obj.constructor;
var proto = (isFunction$1(constructor) && constructor.prototype) || ObjProto;
// Constructor is a special case.
var prop = 'constructor';
if (has$1(obj, prop) && !keys.contains(prop)) keys.push(prop);
while (nonEnumIdx--) {
prop = nonEnumerableProps[nonEnumIdx];
if (prop in obj && obj[prop] !== proto[prop] && !keys.contains(prop)) {
keys.push(prop);
}
}
}
// Retrieve the names of an object's own properties.
// Delegates to **ECMAScript 5**'s native `Object.keys`.
function keys(obj) {
if (!isObject(obj)) return [];
if (nativeKeys) return nativeKeys(obj);
var keys = [];
for (var key in obj) if (has$1(obj, key)) keys.push(key);
// Ahem, IE < 9.
if (hasEnumBug) collectNonEnumProps(obj, keys);
return keys;
}
// Is a given array, string, or object empty?
// An "empty" object has no enumerable own-properties.
function isEmpty(obj) {
if (obj == null) return true;
// Skip the more expensive `toString`-based type checks if `obj` has no
// `.length`.
var length = getLength(obj);
if (typeof length == 'number' && (
isArray(obj) || isString(obj) || isArguments$1(obj)
)) return length === 0;
return getLength(keys(obj)) === 0;
}
// Returns whether an object has a given set of `key:value` pairs.
function isMatch(object, attrs) {
var _keys = keys(attrs), length = _keys.length;
if (object == null) return !length;
var obj = Object(object);
for (var i = 0; i < length; i++) {
var key = _keys[i];
if (attrs[key] !== obj[key] || !(key in obj)) return false;
}
return true;
}
// If Underscore is called as a function, it returns a wrapped object that can
// be used OO-style. This wrapper holds altered versions of all functions added
// through `_.mixin`. Wrapped objects may be chained.
function _$1(obj) {
if (obj instanceof _$1) return obj;
if (!(this instanceof _$1)) return new _$1(obj);
this._wrapped = obj;
}
_$1.VERSION = VERSION;
// Extracts the result from a wrapped and chained object.
_$1.prototype.value = function() {
return this._wrapped;
};
// Provide unwrapping proxies for some methods used in engine operations
// such as arithmetic and JSON stringification.
_$1.prototype.valueOf = _$1.prototype.toJSON = _$1.prototype.value;
_$1.prototype.toString = function() {
return String(this._wrapped);
};
// Internal function to wrap or shallow-copy an ArrayBuffer,
// typed array or DataView to a new view, reusing the buffer.
function toBufferView(bufferSource) {
return new Uint8Array(
bufferSource.buffer || bufferSource,
bufferSource.byteOffset || 0,
getByteLength(bufferSource)
);
}
// We use this string twice, so give it a name for minification.
var tagDataView = '[object DataView]';
// Internal recursive comparison function for `_.isEqual`.
function eq(a, b, aStack, bStack) {
// Identical objects are equal. `0 === -0`, but they aren't identical.
// See the [Harmony `egal` proposal](https://wiki.ecmascript.org/doku.php?id=harmony:egal).
if (a === b) return a !== 0 || 1 / a === 1 / b;
// `null` or `undefined` only equal to itself (strict comparison).
if (a == null || b == null) return false;
// `NaN`s are equivalent, but non-reflexive.
if (a !== a) return b !== b;
// Exhaust primitive checks
var type = typeof a;
if (type !== 'function' && type !== 'object' && typeof b != 'object') return false;
return deepEq(a, b, aStack, bStack);
}
// Internal recursive comparison function for `_.isEqual`.
function deepEq(a, b, aStack, bStack) {
// Unwrap any wrapped objects.
if (a instanceof _$1) a = a._wrapped;
if (b instanceof _$1) b = b._wrapped;
// Compare `[[Class]]` names.
var className = toString.call(a);
if (className !== toString.call(b)) return false;
// Work around a bug in IE 10 - Edge 13.
if (hasDataViewBug && className == '[object Object]' && isDataView$1(a)) {
if (!isDataView$1(b)) return false;
className = tagDataView;
}
switch (className) {
// These types are compared by value.
case '[object RegExp]':
// RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
case '[object String]':
// Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
// equivalent to `new String("5")`.
return '' + a === '' + b;
case '[object Number]':
// `NaN`s are equivalent, but non-reflexive.
// Object(NaN) is equivalent to NaN.
if (+a !== +a) return +b !== +b;
// An `egal` comparison is performed for other numeric values.
return +a === 0 ? 1 / +a === 1 / b : +a === +b;
case '[object Date]':
case '[object Boolean]':
// Coerce dates and booleans to numeric primitive values. Dates are compared by their
// millisecond representations. Note that invalid dates with millisecond representations
// of `NaN` are not equivalent.
return +a === +b;
case '[object Symbol]':
return SymbolProto.valueOf.call(a) === SymbolProto.valueOf.call(b);
case '[object ArrayBuffer]':
case tagDataView:
// Coerce to typed array so we can fall through.
return deepEq(toBufferView(a), toBufferView(b), aStack, bStack);
}
var areArrays = className === '[object Array]';
if (!areArrays && isTypedArray$1(a)) {
var byteLength = getByteLength(a);
if (byteLength !== getByteLength(b)) return false;
if (a.buffer === b.buffer && a.byteOffset === b.byteOffset) return true;
areArrays = true;
}
if (!areArrays) {
if (typeof a != 'object' || typeof b != 'object') return false;
// Objects with different constructors are not equivalent, but `Object`s or `Array`s
// from different frames are.
var aCtor = a.constructor, bCtor = b.constructor;
if (aCtor !== bCtor && !(isFunction$1(aCtor) && aCtor instanceof aCtor &&
isFunction$1(bCtor) && bCtor instanceof bCtor)
&& ('constructor' in a && 'constructor' in b)) {
return false;
}
}
// Assume equality for cyclic structures. The algorithm for detecting cyclic
// structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
// Initializing stack of traversed objects.
// It's done here since we only need them for objects and arrays comparison.
aStack = aStack || [];
bStack = bStack || [];
var length = aStack.length;
while (length--) {
// Linear search. Performance is inversely proportional to the number of
// unique nested structures.
if (aStack[length] === a) return bStack[length] === b;
}
// Add the first object to the stack of traversed objects.
aStack.push(a);
bStack.push(b);
// Recursively compare objects and arrays.
if (areArrays) {
// Compare array lengths to determine if a deep comparison is necessary.
length = a.length;
if (length !== b.length) return false;
// Deep compare the contents, ignoring non-numeric properties.
while (length--) {
if (!eq(a[length], b[length], aStack, bStack)) return false;
}
} else {
// Deep compare objects.
var _keys = keys(a), key;
length = _keys.length;
// Ensure that both objects contain the same number of properties before comparing deep equality.
if (keys(b).length !== length) return false;
while (length--) {
// Deep compare each member
key = _keys[length];
if (!(has$1(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
}
}
// Remove the first object from the stack of traversed objects.
aStack.pop();
bStack.pop();
return true;
}
// Perform a deep comparison to check if two objects are equal.
function isEqual(a, b) {
return eq(a, b);
}
// Retrieve all the enumerable property names of an object.
function allKeys(obj) {
if (!isObject(obj)) return [];
var keys = [];
for (var key in obj) keys.push(key);
// Ahem, IE < 9.
if (hasEnumBug) collectNonEnumProps(obj, keys);
return keys;
}
// Since the regular `Object.prototype.toString` type tests don't work for
// some types in IE 11, we use a fingerprinting heuristic instead, based
// on the methods. It's not great, but it's the best we got.
// The fingerprint method lists are defined below.
function ie11fingerprint(methods) {
var length = getLength(methods);
return function(obj) {
if (obj == null) return false;
// `Map`, `WeakMap` and `Set` have no enumerable keys.
var keys = allKeys(obj);
if (getLength(keys)) return false;
for (var i = 0; i < length; i++) {
if (!isFunction$1(obj[methods[i]])) return false;
}
// If we are testing against `WeakMap`, we need to ensure that
// `obj` doesn't have a `forEach` method in order to distinguish
// it from a regular `Map`.
return methods !== weakMapMethods || !isFunction$1(obj[forEachName]);
};
}
// In the interest of compact minification, we write
// each string in the fingerprints only once.
var forEachName = 'forEach',
hasName = 'has',
commonInit = ['clear', 'delete'],
mapTail = ['get', hasName, 'set'];
// `Map`, `WeakMap` and `Set` each have slightly different
// combinations of the above sublists.
var mapMethods = commonInit.concat(forEachName, mapTail),
weakMapMethods = commonInit.concat(mapTail),
setMethods = ['add'].concat(commonInit, forEachName, hasName);
var isMap = isIE11 ? ie11fingerprint(mapMethods) : tagTester('Map');
var isWeakMap = isIE11 ? ie11fingerprint(weakMapMethods) : tagTester('WeakMap');
var isSet = isIE11 ? ie11fingerprint(setMethods) : tagTester('Set');
var isWeakSet = tagTester('WeakSet');
// Retrieve the values of an object's properties.
function values(obj) {
var _keys = keys(obj);
var length = _keys.length;
var values = Array(length);
for (var i = 0; i < length; i++) {
values[i] = obj[_keys[i]];
}
return values;
}
// Convert an object into a list of `[key, value]` pairs.
// The opposite of `_.object` with one argument.
function pairs(obj) {
var _keys = keys(obj);
var length = _keys.length;
var pairs = Array(length);
for (var i = 0; i < length; i++) {
pairs[i] = [_keys[i], obj[_keys[i]]];
}
return pairs;
}
// Invert the keys and values of an object. The values must be serializable.
function invert(obj) {
var result = {};
var _keys = keys(obj);
for (var i = 0, length = _keys.length; i < length; i++) {
result[obj[_keys[i]]] = _keys[i];
}
return result;
}
// Return a sorted list of the function names available on the object.
function functions(obj) {
var names = [];
for (var key in obj) {
if (isFunction$1(obj[key])) names.push(key);
}
return names.sort();
}
// An internal function for creating assigner functions.
function createAssigner(keysFunc, defaults) {
return function(obj) {
var length = arguments.length;
if (defaults) obj = Object(obj);
if (length < 2 || obj == null) return obj;
for (var index = 1; index < length; index++) {
var source = arguments[index],
keys = keysFunc(source),
l = keys.length;
for (var i = 0; i < l; i++) {
var key = keys[i];
if (!defaults || obj[key] === void 0) obj[key] = source[key];
}
}
return obj;
};
}
// Extend a given object with all the properties in passed-in object(s).
var extend = createAssigner(allKeys);
// Assigns a given object with all the own properties in the passed-in
// object(s).
// (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
var extendOwn = createAssigner(keys);
// Fill in a given object with default properties.
var defaults = createAssigner(allKeys, true);
// Create a naked function reference for surrogate-prototype-swapping.
function ctor() {
return function(){};
}
// An internal function for creating a new object that inherits from another.
function baseCreate(prototype) {
if (!isObject(prototype)) return {};
if (nativeCreate) return nativeCreate(prototype);
var Ctor = ctor();
Ctor.prototype = prototype;
var result = new Ctor;
Ctor.prototype = null;
return result;
}
// Creates an object that inherits from the given prototype object.
// If additional properties are provided then they will be added to the
// created object.
function create(prototype, props) {
var result = baseCreate(prototype);
if (props) extendOwn(result, props);
return result;
}
// Create a (shallow-cloned) duplicate of an object.
function clone(obj) {
if (!isObject(obj)) return obj;
return isArray(obj) ? obj.slice() : extend({}, obj);
}
// Invokes `interceptor` with the `obj` and then returns `obj`.
// The primary purpose of this method is to "tap into" a method chain, in
// order to perform operations on intermediate results within the chain.
function tap(obj, interceptor) {
interceptor(obj);
return obj;
}
// Normalize a (deep) property `path` to array.
// Like `_.iteratee`, this function can be customized.
function toPath$1(path) {
return isArray(path) ? path : [path];
}
_$1.toPath = toPath$1;
// Internal wrapper for `_.toPath` to enable minification.
// Similar to `cb` for `_.iteratee`.
function toPath(path) {
return _$1.toPath(path);
}
// Internal function to obtain a nested property in `obj` along `path`.
function deepGet(obj, path) {
var length = path.length;
for (var i = 0; i < length; i++) {
if (obj == null) return void 0;
obj = obj[path[i]];
}
return length ? obj : void 0;
}
// Get the value of the (deep) property on `path` from `object`.
// If any property in `path` does not exist or if the value is
// `undefined`, return `defaultValue` instead.
// The `path` is normalized through `_.toPath`.
function get(object, path, defaultValue) {
var value = deepGet(object, toPath(path));
return isUndefined(value) ? defaultValue : value;
}
// Shortcut function for checking if an object has a given property directly on
// itself (in other words, not on a prototype). Unlike the internal `has`
// function, this public version can also traverse nested properties.
function has(obj, path) {
path = toPath(path);
var length = path.length;
for (var i = 0; i < length; i++) {
var key = path[i];
if (!has$1(obj, key)) return false;
obj = obj[key];
}
return !!length;
}
// Keep the identity function around for default iteratees.
function identity(value) {
return value;
}
// Returns a predicate for checking whether an object has a given set of
// `key:value` pairs.
function matcher(attrs) {
attrs = extendOwn({}, attrs);
return function(obj) {
return isMatch(obj, attrs);
};
}
// Creates a function that, when passed an object, will traverse that object’s
// properties down the given `path`, specified as an array of keys or indices.
function property(path) {
path = toPath(path);
return function(obj) {
return deepGet(obj, path);
};
}
// Internal function that returns an efficient (for current engines) version
// of the passed-in callback, to be repeatedly applied in other Underscore
// functions.
function optimizeCb(func, context, argCount) {
if (context === void 0) return func;
switch (argCount == null ? 3 : argCount) {
case 1: return function(value) {
return func.call(context, value);
};
// The 2-argument case is omitted because we’re not using it.
case 3: return function(value, index, collection) {
return func.call(context, value, index, collection);
};
case 4: return function(accumulator, value, index, collection) {
return func.call(context, accumulator, value, index, collection);
};
}
return function() {
return func.apply(context, arguments);
};
}
// An internal function to generate callbacks that can be applied to each
// element in a collection, returning the desired result — either `_.identity`,
// an arbitrary callback, a property matcher, or a property accessor.
function baseIteratee(value, context, argCount) {
if (value == null) return identity;
if (isFunction$1(value)) return optimizeCb(value, context, argCount);
if (isObject(value) && !isArray(value)) return matcher(value);
return property(value);
}
// External wrapper for our callback generator. Users may customize
// `_.iteratee` if they want additional predicate/iteratee shorthand styles.
// This abstraction hides the internal-only `argCount` argument.
function iteratee(value, context) {
return baseIteratee(value, context, Infinity);
}
_$1.iteratee = iteratee;
// The function we call internally to generate a callback. It invokes
// `_.iteratee` if overridden, otherwise `baseIteratee`.
function cb(value, context, argCount) {
if (_$1.iteratee !== iteratee) return _$1.iteratee(value, context);
return baseIteratee(value, context, argCount);
}
// Returns the results of applying the `iteratee` to each element of `obj`.
// In contrast to `_.map` it returns an object.
function mapObject(obj, iteratee, context) {
iteratee = cb(iteratee, context);
var _keys = keys(obj),
length = _keys.length,
results = {};
for (var index = 0; index < length; index++) {
var currentKey = _keys[index];
results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
}
return results;
}
// Predicate-generating function. Often useful outside of Underscore.
function noop(){}
// Generates a function for a given object that returns a given property.
function propertyOf(obj) {
if (obj == null) return noop;
return function(path) {
return get(obj, path);
};
}
// Run a function **n** times.
function times(n, iteratee, context) {
var accum = Array(Math.max(0, n));
iteratee = optimizeCb(iteratee, context, 1);
for (var i = 0; i < n; i++) accum[i] = iteratee(i);
return accum;
}
// Return a random integer between `min` and `max` (inclusive).
function random(min, max) {
if (max == null) {
max = min;
min = 0;
}
return min + Math.floor(Math.random() * (max - min + 1));
}
// A (possibly faster) way to get the current timestamp as an integer.
var now = Date.now || function() {
return new Date().getTime();
};
// Internal helper to generate functions for escaping and unescaping strings
// to/from HTML interpolation.
function createEscaper(map) {
var escaper = function(match) {
return map[match];
};
// Regexes for identifying a key that needs to be escaped.
var source = '(?:' + keys(map).join('|') + ')';
var testRegexp = RegExp(source);
var replaceRegexp = RegExp(source, 'g');
return function(string) {
string = string == null ? '' : '' + string;
return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
};
}
// Internal list of HTML entities for escaping.
var escapeMap = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": ''',
'`': '`'
};
// Function for escaping strings to HTML interpolation.
var _escape = createEscaper(escapeMap);
// Internal list of HTML entities for unescaping.
var unescapeMap = invert(escapeMap);
// Function for unescaping strings from HTML interpolation.
var _unescape = createEscaper(unescapeMap);
// By default, Underscore uses ERB-style template delimiters. Change the
// following template settings to use alternative delimiters.
var templateSettings = _$1.templateSettings = {
evaluate: /<%([\s\S]+?)%>/g,
interpolate: /<%=([\s\S]+?)%>/g,
escape: /<%-([\s\S]+?)%>/g
};
// When customizing `_.templateSettings`, if you don't want to define an
// interpolation, evaluation or escaping regex, we need one that is
// guaranteed not to match.
var noMatch = /(.)^/;
// Certain characters need to be escaped so that they can be put into a
// string literal.
var escapes = {
"'": "'",
'\\': '\\',
'\r': 'r',
'\n': 'n',
'\u2028': 'u2028',
'\u2029': 'u2029'
};
var escapeRegExp = /\\|'|\r|\n|\u2028|\u2029/g;
function escapeChar(match) {
return '\\' + escapes[match];
}
// In order to prevent third-party code injection through
// `_.templateSettings.variable`, we test it against the following regular
// expression. It is intentionally a bit more liberal than just matching valid
// identifiers, but still prevents possible loopholes through defaults or
// destructuring assignment.
var bareIdentifier = /^\s*(\w|\$)+\s*$/;
// JavaScript micro-templating, similar to John Resig's implementation.
// Underscore templating handles arbitrary delimiters, preserves whitespace,
// and correctly escapes quotes within interpolated code.
// NB: `oldSettings` only exists for backwards compatibility.
function template(text, settings, oldSettings) {
if (!settings && oldSettings) settings = oldSettings;
settings = defaults({}, settings, _$1.templateSettings);
// Combine delimiters into one regular expression via alternation.
var matcher = RegExp([
(settings.escape || noMatch).source,
(settings.interpolate || noMatch).source,
(settings.evaluate || noMatch).source
].join('|') + '|$', 'g');
// Compile the template source, escaping string literals appropriately.
var index = 0;
var source = "__p+='";
text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
source += text.slice(index, offset).replace(escapeRegExp, escapeChar);
index = offset + match.length;
if (escape) {
source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
} else if (interpolate) {
source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
} else if (evaluate) {
source += "';\n" + evaluate + "\n__p+='";
}
// Adobe VMs need the match returned to produce the correct offset.
return match;
});
source += "';\n";
var argument = settings.variable;
if (argument) {
// Insure against third-party code injection. (CVE-2021-23358)
if (!bareIdentifier.test(argument)) throw new Error(
'variable is not a bare identifier: ' + argument
);
} else {
// If a variable is not specified, place data values in local scope.
source = 'with(obj||{}){\n' + source + '}\n';
argument = 'obj';
}
source = "var __t,__p='',__j=Array.prototype.join," +
"print=function(){__p+=__j.call(arguments,'');};\n" +
source + 'return __p;\n';
var render;
try {
render = new Function(argument, '_', source);
} catch (e) {
e.source = source;
throw e;
}
var template = function(data) {
return render.call(this, data, _$1);
};
// Provide the compiled source as a convenience for precompilation.
template.source = 'function(' + argument + '){\n' + source + '}';
return template;
}
// Traverses the children of `obj` along `path`. If a child is a function, it
// is invoked with its parent as context. Returns the value of the final
// child, or `fallback` if any child is undefined.
function result(obj, path, fallback) {
path = toPath(path);
var length = path.length;
if (!length) {
return isFunction$1(fallback) ? fallback.call(obj) : fallback;
}
for (var i = 0; i < length; i++) {
var prop = obj == null ? void 0 : obj[path[i]];
if (prop === void 0) {
prop = fallback;
i = length; // Ensure we don't continue iterating.
}
obj = isFunction$1(prop) ? prop.call(obj) : prop;
}
return obj;
}
// Generate a unique integer id (unique within the entire client session).
// Useful for temporary DOM ids.
var idCounter = 0;
function uniqueId(prefix) {
var id = ++idCounter + '';
return prefix ? prefix + id : id;
}
// Start chaining a wrapped Underscore object.
function chain(obj) {
var instance = _$1(obj);
instance._chain = true;
return instance;
}
// Internal function to execute `sourceFunc` bound to `context` with optional
// `args`. Determines whether to execute a function as a constructor or as a
// normal function.
function executeBound(sourceFunc, boundFunc, context, callingContext, args) {
if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
var self = baseCreate(sourceFunc.prototype);
var result = sourceFunc.apply(self, args);
if (isObject(result)) return result;
return self;
}
// Partially apply a function by creating a version that has had some of its
// arguments pre-filled, without changing its dynamic `this` context. `_` acts
// as a placeholder by default, allowing any combination of arguments to be
// pre-filled. Set `_.partial.placeholder` for a custom placeholder argument.
var partial = restArguments(function(func, boundArgs) {
var placeholder = partial.placeholder;
var bound = function() {
var position = 0, length = boundArgs.length;
var args = Array(length);
for (var i = 0; i < length; i++) {
args[i] = boundArgs[i] === placeholder ? arguments[position++] : boundArgs[i];
}
while (position < arguments.length) args.push(arguments[position++]);
return executeBound(func, bound, this, this, args);
};
return bound;
});
partial.placeholder = _$1;
// Create a function bound to a given object (assigning `this`, and arguments,
// optionally).
var bind = restArguments(function(func, context, args) {
if (!isFunction$1(func)) throw new TypeError('Bind must be called on a function');
var bound = restArguments(function(callArgs) {
return executeBound(func, bound, context, this, args.concat(callArgs));
});
return bound;
});
// Internal helper for collection methods to determine whether a collection
// should be iterated as an array or as an object.
// Related: https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
// Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
var isArrayLike = createSizePropertyCheck(getLength);
// Internal implementation of a recursive `flatten` function.
function flatten$1(input, depth, strict, output) {
output = output || [];
if (!depth && depth !== 0) {
depth = Infinity;
} else if (depth <= 0) {
return output.concat(input);
}
var idx = output.length;
for (var i = 0, length = getLength(input); i < length; i++) {
var value = input[i];
if (isArrayLike(value) && (isArray(value) || isArguments$1(value))) {
// Flatten current level of array or arguments object.
if (depth > 1) {
flatten$1(value, depth - 1, strict, output);
idx = output.length;
} else {
var j = 0, len = value.length;
while (j < len) output[idx++] = value[j++];
}
} else if (!strict) {
output[idx++] = value;
}
}
return output;
}
// Bind a number of an object's methods to that object. Remaining arguments
// are the method names to be bound. Useful for ensuring that all callbacks
// defined on an object belong to it.
var bindAll = restArguments(function(obj, keys) {
keys = flatten$1(keys, false, false);
var index = keys.length;
if (index < 1) throw new Error('bindAll must be passed function names');
while (index--) {
var key = keys[index];
obj[key] = bind(obj[key], obj);
}
return obj;
});
// Memoize an expensive function by storing its results.
function memoize(func, hasher) {
var memoize = function(key) {
var cache = memoize.cache;
var address = '' + (hasher ? hasher.apply(this, arguments) : key);
if (!has$1(cache, address)) cache[address] = func.apply(this, arguments);
return cache[address];
};
memoize.cache = {};
return memoize;
}
// Delays a function for the given number of milliseconds, and then calls
// it with the arguments supplied.
var delay = restArguments(function(func, wait, args) {
return setTimeout(function() {
return func.apply(null, args);
}, wait);
});
// Defers a function, scheduling it to run after the current call stack has
// cleared.
var defer = partial(delay, _$1, 1);
// Returns a function, that, when invoked, will only be triggered at most once
// during a given window of time. Normally, the throttled function will run
// as much as it can, without ever going more than once per `wait` duration;
// but if you'd like to disable the execution on the leading edge, pass
// `{leading: false}`. To disable execution on the trailing edge, ditto.
function throttle(func, wait, options) {
var timeout, context, args, result;
var previous = 0;
if (!options) options = {};
var later = function() {
previous = options.leading === false ? 0 : now();
timeout = null;
result = func.apply(context, args);
if (!timeout) context = args = null;
};
var throttled = function() {
var _now = now();
if (!previous && options.leading === false) previous = _now;
var remaining = wait - (_now - previous);
context = this;
args = arguments;
if (remaining <= 0 || remaining > wait) {
if (timeout) {
clearTimeout(timeout);
timeout = null;
}
previous = _now;
result = func.apply(context, args);
if (!timeout) context = args = null;
} else if (!timeout && options.trailing !== false) {
timeout = setTimeout(later, remaining);
}
return result;
};
throttled.cancel = function() {
clearTimeout(timeout);
previous = 0;
timeout = context = args = null;
};
return throttled;
}
// When a sequence of calls of the returned function ends, the argument
// function is triggered. The end of a sequence is defined by the `wait`
// parameter. If `immediate` is passed, the argument function will be
// triggered at the beginning of the sequence instead of at the end.
function debounce(func, wait, immediate) {
var timeout, previous, args, result, context;
var later = function() {
var passed = now() - previous;
if (wait > passed) {
timeout = setTimeout(later, wait - passed);
} else {
timeout = null;
if (!immediate) result = func.apply(context, args);
// This check is needed because `func` can recursively invoke `debounced`.
if (!timeout) args = context = null;
}
};
var debounced = restArguments(function(_args) {
context = this;
args = _args;
previous = now();
if (!timeout) {
timeout = setTimeout(later, wait);
if (immediate) result = func.apply(context, args);
}
return result;
});
debounced.cancel = function() {
clearTimeout(timeout);
timeout = args = context = null;
};
return debounced;
}
// Returns the first function passed as an argument to the second,
// allowing you to adjust arguments, run code before and after, and
// conditionally execute the original function.
function wrap(func, wrapper) {
return partial(wrapper, func);
}
// Returns a negated version of the passed-in predicate.
function negate(predicate) {
return function() {
return !predicate.apply(this, arguments);
};
}
// Returns a function that is the composition of a list of functions, each
// consuming the return value of the function that follows.
function compose() {
var args = arguments;
var start = args.length - 1;
return function() {
var i = start;
var result = args[start].apply(this, arguments);
while (i--) result = args[i].call(this, result);
return result;
};
}
// Returns a function that will only be executed on and after the Nth call.
function after(times, func) {
return function() {
if (--times < 1) {
return func.apply(this, arguments);
}
};
}
// Returns a function that will only be executed up to (but not including) the
// Nth call.
function before(times, func) {
var memo;
return function() {
if (--times > 0) {
memo = func.apply(this, arguments);
}
if (times <= 1) func = null;
return memo;
};
}
// Returns a function that will be executed at most one time, no matter how
// often you call it. Useful for lazy initialization.
var once = partial(before, 2);
// Returns the first key on an object that passes a truth test.
function findKey(obj, predicate, context) {
predicate = cb(predicate, context);
var _keys = keys(obj), key;
for (var i = 0, length = _keys.length; i < length; i++) {
key = _keys[i];
if (predicate(obj[key], key, obj)) return key;
}
}
// Internal function to generate `_.findIndex` and `_.findLastIndex`.
function createPredicateIndexFinder(dir) {
return function(array, predicate, context) {
predicate = cb(predicate, context);
var length = getLength(array);
var index = dir > 0 ? 0 : length - 1;
for (; index >= 0 && index < length; index += dir) {
if (predicate(array[index], index, array)) return index;
}
return -1;
};
}
// Returns the first index on an array-like that passes a truth test.
var findIndex = createPredicateIndexFinder(1);
// Returns the last index on an array-like that passes a truth test.
var findLastIndex = createPredicateIndexFinder(-1);
// Use a comparator function to figure out the smallest index at which
// an object should be inserted so as to maintain order. Uses binary search.
function sortedIndex(array, obj, iteratee, context) {
iteratee = cb(iteratee, context, 1);
var value = iteratee(obj);
var low = 0, high = getLength(array);
while (low < high) {
var mid = Math.floor((low + high) / 2);
if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;
}
return low;
}
// Internal function to generate the `_.indexOf` and `_.lastIndexOf` functions.
function createIndexFinder(dir, predicateFind, sortedIndex) {
return function(array, item, idx) {
var i = 0, length = getLength(array);
if (typeof idx == 'number') {
if (dir > 0) {
i = idx >= 0 ? idx : Math.max(idx + length, i);
} else {
length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
}
} else if (sortedIndex && idx && length) {
idx = sortedIndex(array, item);
return array[idx] === item ? idx : -1;
}
if (item !== item) {
idx = predicateFind(slice.call(array, i, length), isNaN$1);
return idx >= 0 ? idx + i : -1;
}
for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
if (array[idx] === item) return idx;
}
return -1;
};
}
// Return the position of the first occurrence of an item in an array,
// or -1 if the item is not included in the array.
// If the array is large and already in sort order, pass `true`
// for **isSorted** to use binary search.
var indexOf = createIndexFinder(1, findIndex, sortedIndex);
// Return the position of the last occurrence of an item in an array,
// or -1 if the item is not included in the array.
var lastIndexOf = createIndexFinder(-1, findLastIndex);
// Return the first value which passes a truth test.
function find(obj, predicate, context) {
var keyFinder = isArrayLike(obj) ? findIndex : findKey;
var key = keyFinder(obj, predicate, context);
if (key !== void 0 && key !== -1) return obj[key];
}
// Convenience version of a common use case of `_.find`: getting the first
// object containing specific `key:value` pairs.
function findWhere(obj, attrs) {
return find(obj, matcher(attrs));
}
// The cornerstone for collection functions, an `each`
// implementation, aka `forEach`.
// Handles raw objects in addition to array-likes. Treats all
// sparse array-likes as if they were dense.
function each(obj, iteratee, context) {
iteratee = optimizeCb(iteratee, context);
var i, length;
if (isArrayLike(obj)) {
for (i = 0, length = obj.length; i < length; i++) {
iteratee(obj[i], i, obj);
}
} else {
var _keys = keys(obj);
for (i = 0, length = _keys.length; i < length; i++) {
iteratee(obj[_keys[i]], _keys[i], obj);
}
}
return obj;
}
// Return the results of applying the iteratee to each element.
function map(obj, iteratee, context) {
iteratee = cb(iteratee, context);
var _keys = !isArrayLike(obj) && keys(obj),
length = (_keys || obj).length,
results = Array(length);
for (var index = 0; index < length; index++) {
var currentKey = _keys ? _keys[index] : index;
results[index] = iteratee(obj[currentKey], currentKey, obj);
}
return results;
}
// Internal helper to create a reducing function, iterating left or right.
function createReduce(dir) {
// Wrap code that reassigns argument variables in a separate function than
// the one that accesses `arguments.length` to avoid a perf hit. (#1991)
var reducer = function(obj, iteratee, memo, initial) {
var _keys = !isArrayLike(obj) && keys(obj),
length = (_keys || obj).length,
index = dir > 0 ? 0 : length - 1;
if (!initial) {
memo = obj[_keys ? _keys[index] : index];
index += dir;
}
for (; index >= 0 && index < length; index += dir) {
var currentKey = _keys ? _keys[index] : index;
memo = iteratee(memo, obj[currentKey], currentKey, obj);
}
return memo;
};
return function(obj, iteratee, memo, context) {
var initial = arguments.length >= 3;
return reducer(obj, optimizeCb(iteratee, context, 4), memo, initial);
};
}
// **Reduce** builds up a single result from a list of values, aka `inject`,
// or `foldl`.
var reduce = createReduce(1);
// The right-associative version of reduce, also known as `foldr`.
var reduceRight = createReduce(-1);
// Return all the elements that pass a truth test.
function filter(obj, predicate, context) {
var results = [];
predicate = cb(predicate, context);
each(obj, function(value, index, list) {
if (predicate(value, index, list)) results.push(value);
});
return results;
}
// Return all the elements for which a truth test fails.
function reject(obj, predicate, context) {
return filter(obj, negate(cb(predicate)), context);
}
// Determine whether all of the elements pass a truth test.
function every(obj, predicate, context) {
predicate = cb(predicate, context);
var _keys = !isArrayLike(obj) && keys(obj),
length = (_keys || obj).length;
for (var index = 0; index < length; index++) {
var currentKey = _keys ? _keys[index] : index;
if (!predicate(obj[currentKey], currentKey, obj)) return false;
}
return true;
}
// Determine if at least one element in the object passes a truth test.
function some(obj, predicate, context) {
predicate = cb(predicate, context);
var _keys = !isArrayLike(obj) && keys(obj),
length = (_keys || obj).length;
for (var index = 0; index < length; index++) {
var currentKey = _keys ? _keys[index] : index;
if (predicate(obj[currentKey], currentKey, obj)) return true;
}
return false;
}
// Determine if the array or object contains a given item (using `===`).
function contains(obj, item, fromIndex, guard) {
if (!isArrayLike(obj)) obj = values(obj);
if (typeof fromIndex != 'number' || guard) fromIndex = 0;
return indexOf(obj, item, fromIndex) >= 0;
}
// Invoke a method (with arguments) on every item in a collection.
var invoke = restArguments(function(obj, path, args) {
var contextPath, func;
if (isFunction$1(path)) {
func = path;
} else {
path = toPath(path);
contextPath = path.slice(0, -1);
path = path[path.length - 1];
}
return map(obj, function(context) {
var method = func;
if (!method) {
if (contextPath && contextPath.length) {
context = deepGet(context, contextPath);
}
if (context == null) return void 0;
method = context[path];
}
return method == null ? method : method.apply(context, args);
});
});
// Convenience version of a common use case of `_.map`: fetching a property.
function pluck(obj, key) {
return map(obj, property(key));
}
// Convenience version of a common use case of `_.filter`: selecting only
// objects containing specific `key:value` pairs.
function where(obj, attrs) {
return filter(obj, matcher(attrs));
}
// Return the maximum element (or element-based computation).
function max(obj, iteratee, context) {
var result = -Infinity, lastComputed = -Infinity,
value, computed;
if (iteratee == null || (typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null)) {
obj = isArrayLike(obj) ? obj : values(obj);
for (var i = 0, length = obj.length; i < length; i++) {
value = obj[i];
if (value != null && value > result) {
result = value;
}
}
} else {
iteratee = cb(iteratee, context);
each(obj, function(v, index, list) {
computed = iteratee(v, index, list);
if (computed > lastComputed || (computed === -Infinity && result === -Infinity)) {
result = v;
lastComputed = computed;
}
});
}
return result;
}
// Return the minimum element (or element-based computation).
function min(obj, iteratee, context) {
var result = Infinity, lastComputed = Infinity,
value, computed;
if (iteratee == null || (typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null)) {
obj = isArrayLike(obj) ? obj : values(obj);
for (var i = 0, length = obj.length; i < length; i++) {
value = obj[i];
if (value != null && value < result) {
result = value;
}
}
} else {
iteratee = cb(iteratee, context);
each(obj, function(v, index, list) {
computed = iteratee(v, index, list);
if (computed < lastComputed || (computed === Infinity && result === Infinity)) {
result = v;
lastComputed = computed;
}
});
}
return result;
}
// Safely create a real, live array from anything iterable.
var reStrSymbol = /[^\ud800-\udfff]|[\ud800-\udbff][\udc00-\udfff]|[\ud800-\udfff]/g;
function toArray(obj) {
if (!obj) return [];
if (isArray(obj)) return slice.call(obj);
if (isString(obj)) {
// Keep surrogate pair characters together.
return obj.match(reStrSymbol);
}
if (isArrayLike(obj)) return map(obj, identity);
return values(obj);
}
// Sample **n** random values from a collection using the modern version of the
// [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
// If **n** is not specified, returns a single random element.
// The internal `guard` argument allows it to work with `_.map`.
function sample(obj, n, guard) {
if (n == null || guard) {
if (!isArrayLike(obj)) obj = values(obj);
return obj[random(obj.length - 1)];
}
var sample = toArray(obj);
var length = getLength(sample);
n = Math.max(Math.min(n, length), 0);
var last = length - 1;
for (var index = 0; index < n; index++) {
var rand = random(index, last);
var temp = sample[index];
sample[index] = sample[rand];
sample[rand] = temp;
}
return sample.slice(0, n);
}
// Shuffle a collection.
function shuffle(obj) {
return sample(obj, Infinity);
}
// Sort the object's values by a criterion produced by an iteratee.
function sortBy(obj, iteratee, context) {
var index = 0;
iteratee = cb(iteratee, context);
return pluck(map(obj, function(value, key, list) {
return {
value: value,
index: index++,
criteria: iteratee(value, key, list)
};
}).sort(function(left, right) {
var a = left.criteria;
var b = right.criteria;
if (a !== b) {
if (a > b || a === void 0) return 1;
if (a < b || b === void 0) return -1;
}
return left.index - right.index;
}), 'value');
}
// An internal function used for aggregate "group by" operations.
function group(behavior, partition) {
return function(obj, iteratee, context) {
var result = partition ? [[], []] : {};
iteratee = cb(iteratee, context);
each(obj, function(value, index) {
var key = iteratee(value, index, obj);
behavior(result, value, key);
});
return result;
};
}
// Groups the object's values by a criterion. Pass either a string attribute
// to group by, or a function that returns the criterion.
var groupBy = group(function(result, value, key) {
if (has$1(result, key)) result[key].push(value); else result[key] = [value];
});
// Indexes the object's values by a criterion, similar to `_.groupBy`, but for
// when you know that your index values will be unique.
var indexBy = group(function(result, value, key) {
result[key] = value;
});
// Counts instances of an object that group by a certain criterion. Pass
// either a string attribute to count by, or a function that returns the
// criterion.
var countBy = group(function(result, value, key) {
if (has$1(result, key)) result[key]++; else result[key] = 1;
});
// Split a collection into two arrays: one whose elements all pass the given
// truth test, and one whose elements all do not pass the truth test.
var partition = group(function(result, value, pass) {
result[pass ? 0 : 1].push(value);
}, true);
// Return the number of elements in a collection.
function size(obj) {
if (obj == null) return 0;
return isArrayLike(obj) ? obj.length : keys(obj).length;
}
// Internal `_.pick` helper function to determine whether `key` is an enumerable
// property name of `obj`.
function keyInObj(value, key, obj) {
return key in obj;
}
// Return a copy of the object only containing the allowed properties.
var pick = restArguments(function(obj, keys) {
var result = {}, iteratee = keys[0];
if (obj == null) return result;
if (isFunction$1(iteratee)) {
if (keys.length > 1) iteratee = optimizeCb(iteratee, keys[1]);
keys = allKeys(obj);
} else {
iteratee = keyInObj;
keys = flatten$1(keys, false, false);
obj = Object(obj);
}
for (var i = 0, length = keys.length; i < length; i++) {
var key = keys[i];
var value = obj[key];
if (iteratee(value, key, obj)) result[key] = value;
}
return result;
});
// Return a copy of the object without the disallowed properties.
var omit = restArguments(function(obj, keys) {
var iteratee = keys[0], context;
if (isFunction$1(iteratee)) {
iteratee = negate(iteratee);
if (keys.length > 1) context = keys[1];
} else {
keys = map(flatten$1(keys, false, false), String);
iteratee = function(value, key) {
return !contains(keys, key);
};
}
return pick(obj, iteratee, context);
});
// Returns everything but the last entry of the array. Especially useful on
// the arguments object. Passing **n** will return all the values in
// the array, excluding the last N.
function initial(array, n, guard) {
return slice.call(array, 0, Math.max(0, array.length - (n == null || guard ? 1 : n)));
}
// Get the first element of an array. Passing **n** will return the first N
// values in the array. The **guard** check allows it to work with `_.map`.
function first(array, n, guard) {
if (array == null || array.length < 1) return n == null || guard ? void 0 : [];
if (n == null || guard) return array[0];
return initial(array, array.length - n);
}
// Returns everything but the first entry of the `array`. Especially useful on
// the `arguments` object. Passing an **n** will return the rest N values in the
// `array`.
function rest(array, n, guard) {
return slice.call(array, n == null || guard ? 1 : n);
}
// Get the last element of an array. Passing **n** will return the last N
// values in the array.
function last(array, n, guard) {
if (array == null || array.length < 1) return n == null || guard ? void 0 : [];
if (n == null || guard) return array[array.length - 1];
return rest(array, Math.max(0, array.length - n));
}
// Trim out all falsy values from an array.
function compact(array) {
return filter(array, Boolean);
}
// Flatten out an array, either recursively (by default), or up to `depth`.
// Passing `true` or `false` as `depth` means `1` or `Infinity`, respectively.
function flatten(array, depth) {
return flatten$1(array, depth, false);
}
// Take the difference between one array and a number of other arrays.
// Only the elements present in just the first array will remain.
var difference = restArguments(function(array, rest) {
rest = flatten$1(rest, true, true);
return filter(array, function(value){
return !contains(rest, value);
});
});
// Return a version of the array that does not contain the specified value(s).
var without = restArguments(function(array, otherArrays) {
return difference(array, otherArrays);
});
// Produce a duplicate-free version of the array. If the array has already
// been sorted, you have the option of using a faster algorithm.
// The faster algorithm will not work with an iteratee if the iteratee
// is not a one-to-one function, so providing an iteratee will disable
// the faster algorithm.
function uniq(array, isSorted, iteratee, context) {
if (!isBoolean(isSorted)) {
context = iteratee;
iteratee = isSorted;
isSorted = false;
}
if (iteratee != null) iteratee = cb(iteratee, context);
var result = [];
var seen = [];
for (var i = 0, length = getLength(array); i < length; i++) {
var value = array[i],
computed = iteratee ? iteratee(value, i, array) : value;
if (isSorted && !iteratee) {
if (!i || seen !== computed) result.push(value);
seen = computed;
} else if (iteratee) {
if (!contains(seen, computed)) {
seen.push(computed);
result.push(value);
}
} else if (!contains(result, value)) {
result.push(value);
}
}
return result;
}
// Produce an array that contains the union: each distinct element from all of
// the passed-in arrays.
var union = restArguments(function(arrays) {
return uniq(flatten$1(arrays, true, true));
});
// Produce an array that contains every item shared between all the
// passed-in arrays.
function intersection(array) {
var result = [];
var argsLength = arguments.length;
for (var i = 0, length = getLength(array); i < length; i++) {
var item = array[i];
if (contains(result, item)) continue;
var j;
for (j = 1; j < argsLength; j++) {
if (!contains(arguments[j], item)) break;
}
if (j === argsLength) result.push(item);
}
return result;
}
// Complement of zip. Unzip accepts an array of arrays and groups
// each array's elements on shared indices.
function unzip(array) {
var length = (array && max(array, getLength).length) || 0;
var result = Array(length);
for (var index = 0; index < length; index++) {
result[index] = pluck(array, index);
}
return result;
}
// Zip together multiple lists into a single array -- elements that share
// an index go together.
var zip = restArguments(unzip);
// Converts lists into objects. Pass either a single array of `[key, value]`
// pairs, or two parallel arrays of the same length -- one of keys, and one of
// the corresponding values. Passing by pairs is the reverse of `_.pairs`.
function object(list, values) {
var result = {};
for (var i = 0, length = getLength(list); i < length; i++) {
if (values) {
result[list[i]] = values[i];
} else {
result[list[i][0]] = list[i][1];
}
}
return result;
}
// Generate an integer Array containing an arithmetic progression. A port of
// the native Python `range()` function. See
// [the Python documentation](https://docs.python.org/library/functions.html#range).
function range(start, stop, step) {
if (stop == null) {
stop = start || 0;
start = 0;
}
if (!step) {
step = stop < start ? -1 : 1;
}
var length = Math.max(Math.ceil((stop - start) / step), 0);
var range = Array(length);
for (var idx = 0; idx < length; idx++, start += step) {
range[idx] = start;
}
return range;
}
// Chunk a single array into multiple arrays, each containing `count` or fewer
// items.
function chunk(array, count) {
if (count == null || count < 1) return [];
var result = [];
var i = 0, length = array.length;
while (i < length) {
result.push(slice.call(array, i, i += count));
}
return result;
}
// Helper function to continue chaining intermediate results.
function chainResult(instance, obj) {
return instance._chain ? _$1(obj).chain() : obj;
}
// Add your own custom functions to the Underscore object.
function mixin(obj) {
each(functions(obj), function(name) {
var func = _$1[name] = obj[name];
_$1.prototype[name] = function() {
var args = [this._wrapped];
push.apply(args, arguments);
return chainResult(this, func.apply(_$1, args));
};
});
return _$1;
}
// Add all mutator `Array` functions to the wrapper.
each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
var method = ArrayProto[name];
_$1.prototype[name] = function() {
var obj = this._wrapped;
if (obj != null) {
method.apply(obj, arguments);
if ((name === 'shift' || name === 'splice') && obj.length === 0) {
delete obj[0];
}
}
return chainResult(this, obj);
};
});
// Add all accessor `Array` functions to the wrapper.
each(['concat', 'join', 'slice'], function(name) {
var method = ArrayProto[name];
_$1.prototype[name] = function() {
var obj = this._wrapped;
if (obj != null) obj = method.apply(obj, arguments);
return chainResult(this, obj);
};
});
// Named Exports
var allExports = {
__proto__: null,
VERSION: VERSION,
restArguments: restArguments,
isObject: isObject,
isNull: isNull,
isUndefined: isUndefined,
isBoolean: isBoolean,
isElement: isElement,
isString: isString,
isNumber: isNumber,
isDate: isDate,
isRegExp: isRegExp,
isError: isError,
isSymbol: isSymbol,
isArrayBuffer: isArrayBuffer,
isDataView: isDataView$1,
isArray: isArray,
isFunction: isFunction$1,
isArguments: isArguments$1,
isFinite: isFinite$1,
isNaN: isNaN$1,
isTypedArray: isTypedArray$1,
isEmpty: isEmpty,
isMatch: isMatch,
isEqual: isEqual,
isMap: isMap,
isWeakMap: isWeakMap,
isSet: isSet,
isWeakSet: isWeakSet,
keys: keys,
allKeys: allKeys,
values: values,
pairs: pairs,
invert: invert,
functions: functions,
methods: functions,
extend: extend,
extendOwn: extendOwn,
assign: extendOwn,
defaults: defaults,
create: create,
clone: clone,
tap: tap,
get: get,
has: has,
mapObject: mapObject,
identity: identity,
constant: constant,
noop: noop,
toPath: toPath$1,
property: property,
propertyOf: propertyOf,
matcher: matcher,
matches: matcher,
times: times,
random: random,
now: now,
escape: _escape,
unescape: _unescape,
templateSettings: templateSettings,
template: template,
result: result,
uniqueId: uniqueId,
chain: chain,
iteratee: iteratee,
partial: partial,
bind: bind,
bindAll: bindAll,
memoize: memoize,
delay: delay,
defer: defer,
throttle: throttle,
debounce: debounce,
wrap: wrap,
negate: negate,
compose: compose,
after: after,
before: before,
once: once,
findKey: findKey,
findIndex: findIndex,
findLastIndex: findLastIndex,
sortedIndex: sortedIndex,
indexOf: indexOf,
lastIndexOf: lastIndexOf,
find: find,
detect: find,
findWhere: findWhere,
each: each,
forEach: each,
map: map,
collect: map,
reduce: reduce,
foldl: reduce,
inject: reduce,
reduceRight: reduceRight,
foldr: reduceRight,
filter: filter,
select: filter,
reject: reject,
every: every,
all: every,
some: some,
any: some,
contains: contains,
includes: contains,
include: contains,
invoke: invoke,
pluck: pluck,
where: where,
max: max,
min: min,
shuffle: shuffle,
sample: sample,
sortBy: sortBy,
groupBy: groupBy,
indexBy: indexBy,
countBy: countBy,
partition: partition,
toArray: toArray,
size: size,
pick: pick,
omit: omit,
first: first,
head: first,
take: first,
initial: initial,
last: last,
rest: rest,
tail: rest,
drop: rest,
compact: compact,
flatten: flatten,
without: without,
uniq: uniq,
unique: uniq,
union: union,
intersection: intersection,
difference: difference,
unzip: unzip,
transpose: unzip,
zip: zip,
object: object,
range: range,
chunk: chunk,
mixin: mixin,
'default': _$1
};
// Default Export
// Add all of the Underscore functions to the wrapper object.
var _ = mixin(allExports);
// Legacy Node.js API.
_._ = _;
return _;
})));
//# sourceMappingURL=underscore-umd.js.map