main.js (2487B)
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 // MAIN // 22 23 /** 24 * Tests if a value is between two values. 25 * 26 * @param {*} value - value to test 27 * @param {*} a - left comparison value 28 * @param {*} b - right comparison value 29 * @param {string} [left="closed"] - indicates whether the left comparison value is inclusive 30 * @param {string} [right="closed"] - indicates whether the right comparison value is inclusive 31 * @throws {TypeError} `left` must be a recognized string 32 * @throws {TypeError} `right` must be a recognized string 33 * @returns {boolean} boolean indicating whether a value is between two values 34 * 35 * @example 36 * var bool = isBetween( 3.14, 3.0, 4.0 ); 37 * // returns true 38 * 39 * @example 40 * var bool = isBetween( 4.5, 3.0, 4.0 ); 41 * // returns false 42 * 43 * @example 44 * var bool = isBetween( 3.14, 3.14, 4.0 ); 45 * // returns true 46 * 47 * @example 48 * var bool = isBetween( 3.14, 3.14, 4.0, 'open', 'closed' ); 49 * // returns false 50 * 51 * @example 52 * var bool = isBetween( 3.14, 3.0, 3.14 ); 53 * // returns true 54 * 55 * @example 56 * var bool = isBetween( 3.14, 3.0, 3.14, 'closed', 'open' ); 57 * // returns false 58 */ 59 function isBetween( value, a, b, left, right ) { 60 if ( arguments.length > 3 ) { 61 if ( left !== 'closed' && left !== 'open' ) { 62 throw new TypeError( 'invalid argument. `left` must be one of the following strings: \'closed\' or \'open\'. Value: `'+left+'`.' ); 63 } 64 if ( right !== 'closed' && right !== 'open' ) { 65 throw new TypeError( 'invalid argument. `right` must be one of the following strings: \'closed\' or \'open\'. Value: `'+right+'`.' ); 66 } 67 } 68 if ( left === 'closed' || left === void 0 ) { 69 if ( right === 'closed' || right === void 0 ) { 70 return ( value >= a && value <= b ); 71 } 72 return ( value >= a && value < b ); 73 } 74 if ( right === 'closed' || right === void 0 ) { 75 return ( value > a && value <= b ); 76 } 77 return ( value > a && value < b ); 78 } 79 80 81 // EXPORTS // 82 83 module.exports = isBetween;