is_nonpositive_integer.js (1287B)
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 floor = require( './../../../../base/special/floor' ); 24 25 26 // MAIN // 27 28 /** 29 * Tests if a finite double-precision floating-point number is a nonpositive integer. 30 * 31 * @param {number} x - value to test 32 * @returns {boolean} boolean indicating whether the value is a nonpositive integer 33 * 34 * @example 35 * var bool = isNonPositiveInteger( -1.0 ); 36 * // returns true 37 * 38 * @example 39 * var bool = isNonPositiveInteger( 0.0 ); 40 * // returns true 41 * 42 * @example 43 * var bool = isNonPositiveInteger( 10.0 ); 44 * // returns false 45 */ 46 function isNonPositiveInteger( x ) { 47 return (floor(x) === x && x <= 0); 48 } 49 50 51 // EXPORTS // 52 53 module.exports = isNonPositiveInteger;