main.js (1318B)
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 isPrime = require( './../../../../base/assert/is-prime' ); 24 var isInteger = require( './../../../../base/assert/is-integer' ); 25 var PINF = require( '@stdlib/constants/float64/pinf' ); 26 27 28 // MAIN // 29 30 /** 31 * Returns a boolean indicating whether a number is a composite. 32 * 33 * @param {number} x - value to test 34 * @returns {boolean} boolean indicating whether a value is a composite number 35 * 36 * @example 37 * var bool = isComposite( 4.0 ); 38 * // returns true 39 * 40 * @example 41 * var bool = isComposite( 5.0 ); 42 * // returns false 43 */ 44 function isComposite( x ) { 45 return isInteger( x ) && ( x > 1 ) && x !== PINF && isPrime( x ) === false; 46 } 47 48 49 // EXPORTS // 50 51 module.exports = isComposite;