main.js (1541B)
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 isString = require( './../../is-string' ).isPrimitive; 24 25 26 // VARIABLES // 27 28 var MAX_ASCII = 127; 29 30 31 // MAIN // 32 33 /** 34 * Tests whether a character belongs to the ASCII character set and whether this is true for all characters in a provided string. 35 * 36 * @param {*} x - value to test 37 * @returns {boolean} boolean indicating if a string has all ASCII characters 38 * 39 * @example 40 * var out = isASCII( 'beep' ); 41 * // returns true 42 * 43 * @example 44 * var out = isASCII( 'È' ); 45 * // returns false 46 * 47 * @example 48 * var out = isASCII( '' ); 49 * // returns false 50 * 51 * @example 52 * var out = isASCII( 123 ); 53 * // returns false 54 */ 55 function isASCII( x ) { 56 var len; 57 var i; 58 if ( !isString( x ) ) { 59 return false; 60 } 61 len = x.length; 62 if ( !len ) { 63 return false; 64 } 65 for ( i = 0; i < len; i++ ) { 66 if ( x.charCodeAt( i ) > MAX_ASCII ) { 67 return false; 68 } 69 } 70 return true; 71 } 72 73 74 // EXPORTS // 75 76 module.exports = isASCII;