com.google.javascript.jscomp.js.es6.array.flat.js Maven / Gradle / Ivy
/*
* Copyright 2018 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/** @fileoverview @suppress {uselessCode} */
'require util/polyfill';
$jscomp.polyfill('Array.prototype.flat', function(orig) {
if (orig) return orig;
/**
* Polyfills Array.prototype.flat.
*
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat
*
* @param {number=} depth
* @return {!Array}
* @this {!IArrayLike}
* @template T, S
* @suppress {reportUnknownTypes}
*/
var flat = function(depth) {
// TODO(sdh): Consider respecting Symbol.species (b/121061255).
depth = depth === undefined ? 1 : depth;
var flattened = [];
for (var i = 0; i < this.length; i++) {
var element = this[i];
if (Array.isArray(element) && depth > 0) {
var inner = Array.prototype.flat.call(element, depth - 1);
flattened.push.apply(flattened, inner);
} else {
flattened.push(element);
}
}
return flattened;
};
return flat;
}, 'es9', 'es5');