/** * @license Apache-2.0 * * Copyright (c) 2020 The Stdlib Authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ 'use strict'; // MODULES // var isInteger = require( './../../is-integer' ).isObject; var cbrt = require( '@stdlib/math/base/special/cbrt' ); var floor = require( '@stdlib/math/base/special/floor' ); // MAIN // /** * Tests if a value is a number object having a value which is a cube number. * * @param {*} value - value to test * @returns {boolean} boolean indicating if a value is a number object having a value which is a cube number * * @example * var bool = isCubeNumber( 8.0 ); * // returns false * * @example * var bool = isCubeNumber( new Number( 8.0 ) ); * // returns true */ function isCubeNumber( value ) { var n; var x; if ( !isInteger( value ) ) { return false; } x = value.valueOf(); n = floor( cbrt( x ) + 0.5 ); return n*n*n === x; } // EXPORTS // module.exports = isCubeNumber;