object.js (1503B)
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 Number = require( '@stdlib/number/ctor' ); 26 var test = require( './try2serialize.js' ); 27 28 29 // VARIABLES // 30 31 var FLG = hasToStringTag(); 32 33 34 // MAIN // 35 36 /** 37 * Tests if a value is a number object. 38 * 39 * @param {*} value - value to test 40 * @returns {boolean} boolean indicating if a value is a number object 41 * 42 * @example 43 * var bool = isNumber( 3.14 ); 44 * // returns false 45 * 46 * @example 47 * var bool = isNumber( new Number( 3.14 ) ); 48 * // returns true 49 */ 50 function isNumber( value ) { 51 if ( typeof value === 'object' ) { 52 if ( value instanceof Number ) { 53 return true; 54 } 55 if ( FLG ) { 56 return test( value ); 57 } 58 return ( nativeClass( value ) === '[object Number]' ); 59 } 60 return false; 61 } 62 63 64 // EXPORTS // 65 66 module.exports = isNumber;