main.js (1670B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 'use strict'; 20 21 // MAIN // 22 23 /** 24 * Tests if two arguments are strictly equal. 25 * 26 * ## Notes 27 * 28 * - In contrast to the strict equality operator `===`, `-0` and `+0` are distinguishable. 29 * 30 * 31 * @param {*} a - first input value 32 * @param {*} b - second input value 33 * @returns {boolean} boolean indicating whether two arguments are strictly equal 34 * 35 * @example 36 * var bool = isStrictEqual( true, true ); 37 * // returns true 38 * 39 * @example 40 * var bool = isStrictEqual( 3.14, 3.14 ); 41 * // returns true 42 * 43 * @example 44 * var bool = isStrictEqual( {}, {} ); 45 * // returns false 46 * 47 * @example 48 * var bool = isStrictEqual( -0.0, -0.0 ); 49 * // returns true 50 * 51 * @example 52 * var bool = isStrictEqual( -0.0, 0.0 ); 53 * // returns false 54 * 55 * @example 56 * var bool = isStrictEqual( NaN, NaN ); 57 * // returns false 58 * 59 * @example 60 * var bool = isStrictEqual( [], [] ); 61 * // returns false 62 */ 63 function isStrictEqual( a, b ) { 64 if ( a === b ) { 65 if ( a === 0.0 ) { 66 return 1.0 / a === 1.0 / b; // handles +-0 67 } 68 return true; 69 } 70 return false; 71 } 72 73 74 // EXPORTS // 75 76 module.exports = isStrictEqual;