function isCheck(arr) { for (let i = 0; i < arr.length; i++) { if (arr[i] === 0) { arr[i] = 'zero'; } else if (arr[i] % 2 === 0) { arr[i] = 'even'; } else { arr[i] = 'odd'; } } return arr; } 上述代码中,我们遍历了数组arr中的
if (!String.prototype.includes) { String.prototype.includes = function(search, start) { 'use strict'; if (typeof start !== 'number') { start = 0; } if (start + search.length > this.length) { return false; } else { return this.indexOf(search, start) !== -1; } }; } Noti...
There are multiple ways to check if a string contains a substring in JavaScript. You can use either String.includes(), String.indexOf(), String.search(), String.match(), regular expressions, or 3rd-party library like Lodash. String.includes() Method The String.includes()provides the most ...
we can check if the value is greater than or equal to zero which returnstrueif there is a whitespace in any index of the string andfalseif otherwise.
function checkInArr(arr, value) { return arr.some(item => item === value || String(item) === String(value)); } 总结 checkInArr 函数是一个实用的工具,用于在JavaScript中检查元素是否存在于数组中。通过理解其基础概念、实现方式、优势和应用场景,以及可能遇到的问题和解决方法,你可以更有效地使用这...
String - the contents to checkoptionsOptions is an optional object containing the following properties:stringsType: BooleanDefault: falseWhether to check for strings as well as numbers.minLengthType: NumberDefault: 0Only used when option strings is true. Limits the minimum string length checking....
String.prototype.includes) { Object.defineProperty(String.prototype, 'includes', { value: function(substring, searchposition) { if (typeof searchposition!== 'number') { searchposition= 0 } if (searchposition+ substring.length > this.length) { return false } else { return this.indexOf(...
TheString.includes()method works in all modern browsers, but not IE.You can push support back to at least IE6 with a polyfill. TheString.indexOf()method# TheString.indexOf()method is an older approach that tells you the starting index of a substring inside a string. If the substring do...
If your method returns a Promise, you can use top-level await to resolve the value instead of wrapping it in an async IIFE. import {expectType, expectError} from 'tsd'; import concat from '.'; expectType<Promise<string>>(concat('foo', 'bar')); expectType<string>(await concat('foo...
Besides the pre-release checklist, you also need to make sure your app meets all requirements listed in the following table. If some of them happen during your app running, you may encounter user complaints or losses. Key things you need to know about IAP integration: ...