To learn more about the String.indexOf() method, read this guide. let str = 'MongoDB, Express, React, Node' The first parameter is the substring to search for, and the second optional parameter is the index to start the search from (the default index is 0). The indexOf() method is case-sensitive and accepts two parameters. If the string does not contain the given substring, it returns -1. The String.indexOf() method returns the index of the first occurrence of the substring. Read this article to learn more about the String.includes() method in JavaScript. includes ( 'express' ) // false (Due to case-sensitive) Note that includes() is case-sensitive and accepts an optional second parameter, an integer, which indicates the position where to start searching for. Here is an example: let str = 'MongoDB, Express, React, Node' The String.includes() method returns true if the string contains the specified substring. It was introduced in ES6 and works in all modern browsers except Internet Explorer. The String.includes()provides the most simple and popular way to check if a string contains a substring in modern JavaScript. Use () only.How to work with the String.xml File in our Android Environment String.includes() Method Later, MooTools 1.5+ changed the signature to match the ES6 standard. However, you should note that MooTools 1.3 signature and ECMAScript 6 signatures for this method differ (on the second argument). MooTools 1.3 forces its own version of (), so websites relying on it should not break.
As a result, the implementation was disabled in Firefox 17 and () was available one version later, in Firefox 18, when outreach to MooTools was leading to the release of MooTools version 1.2.6. With the introduction of this function in Firefox 17, the behavior of that check changed in a way that causes code based on MooTools' () implementation to break. This version of MooTools checks whether () exists and, if it doesn't, MooTools adds its own function. It's been reported that some websites using MooTools 1.2 broke on Firefox 17.
It was renamed to includes() in bug 1102219 due to the following reason: In Firefox 18 - 39, the name of this method was contains().
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