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