primitive.js (1417B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2020 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 isInteger = require( './../../is-integer' ).isPrimitive; 24 var cbrt = require( '@stdlib/math/base/special/cbrt' ); 25 var floor = require( '@stdlib/math/base/special/floor' ); 26 27 28 // MAIN // 29 30 /** 31 * Tests if a value is a number primitive having a value which is a cube number. 32 * 33 * @param {*} value - value to test 34 * @returns {boolean} boolean indicating if a value is a number primitive having a value which is a cube number 35 * 36 * @example 37 * var bool = isCubeNumber( 8.0 ); 38 * // returns true 39 * 40 * @example 41 * var bool = isCubeNumber( new Number( 8.0 ) ); 42 * // returns false 43 */ 44 function isCubeNumber( value ) { 45 var n; 46 if ( !isInteger( value ) ) { 47 return false; 48 } 49 n = floor( cbrt( value ) + 0.5 ); 50 return n*n*n === value; 51 } 52 53 54 // EXPORTS // 55 56 module.exports = isCubeNumber;