is_array_like_object.js (1393B)
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 PINF = require( '@stdlib/constants/float64/pinf' ); 24 var isInteger = require( '@stdlib/math/base/assert/is-integer' ); 25 26 27 // MAIN // 28 29 /** 30 * Tests (loosely) if an input value is an array-like object. 31 * 32 * @private 33 * @param {*} value - value to test 34 * @returns {boolean} boolean indicating if an input value is an array-like object 35 * 36 * @example 37 * var bool = isArrayLikeObject( [] ); 38 * // returns true 39 * 40 * @example 41 * var bool = isArrayLikeObject( '' ); 42 * // returns false 43 */ 44 function isArrayLikeObject( value ) { 45 return ( 46 typeof value === 'object' && 47 value !== null && 48 typeof value.length === 'number' && 49 isInteger( value.length ) && 50 value.length >= 0 && 51 value.length < PINF 52 ); 53 } 54 55 56 // EXPORTS // 57 58 module.exports = isArrayLikeObject;