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. Note: In this example, we haven't used the second parameter (starting_index).How to work with the String.xml File in our Android Environment String.includes() Method Here in this example, we will make a string "s1" and then by using the includes() method, we will find if the string "SCALER" is present in the string s1 or not. There are no exceptions in the string includes() function in javascript. Exceptions of String includes() in Javascript It returns true if the set of characters(string) that is being searched is found in the original string, else it returns false. The string includes() method in javascript returns boolean values only. Return Value of String includes() in Javascript By default, the value of the starting index is zero. Name_of_the_string.includes(search_string) name_of_the_string.includes(search_string, starting_index) Parameters of String Includes() in Javascriptįor the parameter of string includes() function in javascript, we use the "set of characters"(string) that we want to search and the second parameter is optional that is, the starting index (the index from where the search will begin in the original string).
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