object.js (1466B)
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 // MODULES // 22 23 var hasToStringTag = require( './../../has-tostringtag-support' ); 24 var nativeClass = require( '@stdlib/utils/native-class' ); 25 var test = require( './try2serialize.js' ); 26 27 28 // VARIABLES // 29 30 var FLG = hasToStringTag(); 31 32 33 // MAIN // 34 35 /** 36 * Tests if a value is a boolean object. 37 * 38 * @param {*} value - value to test 39 * @returns {boolean} boolean indicating if a value is a boolean object 40 * 41 * @example 42 * var bool = isBoolean( true ); 43 * // returns false 44 * 45 * @example 46 * var bool = isBoolean( new Boolean( false ) ); 47 * // returns true 48 */ 49 function isBoolean( value ) { 50 if ( typeof value === 'object' ) { 51 if ( value instanceof Boolean ) { 52 return true; 53 } 54 if ( FLG ) { 55 return test( value ); 56 } 57 return ( nativeClass( value ) === '[object Boolean]' ); 58 } 59 return false; 60 } 61 62 63 // EXPORTS // 64 65 module.exports = isBoolean;