is_odd.js (1306B)
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 isEven = require( './../../../../base/assert/is-even' ); 24 25 26 // MAIN // 27 28 /** 29 * Tests if a finite numeric value is an odd number. 30 * 31 * @param {number} x - value to test 32 * @returns {boolean} boolean indicating whether the value is an odd number 33 * 34 * @example 35 * var bool = isOdd( 5.0 ); 36 * // returns true 37 * 38 * @example 39 * var bool = isOdd( -2.0 ); 40 * // returns false 41 * 42 * @example 43 * var bool = isOdd( 0.0 ); 44 * // returns false 45 * 46 * @example 47 * var bool = isOdd( NaN ); 48 * // returns false 49 */ 50 function isOdd( x ) { 51 // Check sign to prevent overflow... 52 if ( x > 0.0 ) { 53 return isEven( x-1.0 ); 54 } 55 return isEven( x+1.0 ); 56 } 57 58 59 // EXPORTS // 60 61 module.exports = isOdd;