is_integer.js (1237B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2021 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 // MAIN // 22 23 /** 24 * Tests if a finite double-precision floating-point number is an integer. 25 * 26 * @private 27 * @param {number} x - value to test 28 * @returns {boolean} boolean indicating whether the value is an integer 29 * 30 * @example 31 * var bool = isInteger( 1.0 ); 32 * // returns true 33 * 34 * @example 35 * var bool = isInteger( 3.14 ); 36 * // returns false 37 */ 38 function isInteger( x ) { 39 // NOTE: we explicitly avoid using `@stdlib/math/base/special` here in order to avoid circular dependencies. 40 return ( Math.floor( x ) === x ); // eslint-disable-line stdlib/no-builtin-math 41 } 42 43 44 // EXPORTS // 45 46 module.exports = isInteger;