com.google.javascript.jscomp.js.es6.number.js Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of closure-compiler-unshaded Show documentation

Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

There is a newer version: v20240317

Show newest version

/*
 * Copyright 2016 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 Polyfills for ES6 Number functions.
 */

$jscomp.number = $jscomp.number || {};


/**
 * Returns whether the given argument is a finite number.
 *
 * Polyfills the static function Number.isFinite().
 *
 * @param {*} x Any value.
 * @return {boolean} True if x is a number and not NaN or infinite.
 */
$jscomp.number.isFinite = function(x) {
  if (typeof x !== 'number') return false;
  return !isNaN(x) && x !== Infinity && x !== -Infinity;
};


/**
 * Returns whether the given argument is an integer.
 *
 * 
Polyfills the static function Number.isInteger().
 *
 * @param {*} x Any value.
 * @return {boolean} True if x is an integer.
 */
$jscomp.number.isInteger = function(x) {
  if (!$jscomp.number.isFinite(x)) return false;
  return x === Math.floor(x);
};


/**
 * Returns whether the given argument is the value NaN,
 * guaranteeing not to coerce to a number first.
 *
 * 
Polyfills the static function Number.isNaN().
 *
 * @param {*} x Any value.
 * @return {boolean} True if x is exactly NaN.
 */
$jscomp.number.isNaN = function(x) {
  return typeof x === 'number' && isNaN(x);
};


/**
 * Returns whether the given argument is a "safe" integer,
 * that is, its magnitude is less than 2^53.
 *
 * 
Polyfills the static function Number.isSafeInteger().
 *
 * @param {*} x Any value.
 * @return {boolean} True if x is a safe integer.
 */
$jscomp.number.isSafeInteger = function(x) {
  return $jscomp.number.isInteger(x) &&
      Math.abs(x) <= $jscomp.number.MAX_SAFE_INTEGER;
};


/**
 * The difference 1 and the smallest number greater than 1.
 *
 * 
Polyfills the static field Number.EPSILON.
 *
 * @const {number}
 */
$jscomp.number.EPSILON = Math.pow(2, -52);


/**
 * The maximum safe integer, 2^53 - 1.
 *
 * 
Polyfills the static field Number.MAX_SAFE_INTEGER.
 *
 * @const {number}
 */
$jscomp.number.MAX_SAFE_INTEGER = 0x1fffffffffffff;


/**
 * The minimum safe integer, -(2^53 - 1).
 *
 * Polyfills the static field Number.MIN_SAFE_INTEGER.
 *
 * @const {number}
 */
$jscomp.number.MIN_SAFE_INTEGER = -0x1fffffffffffff;