Something to keep in mind is that the includes() method is case-sensitive.

A Boolean value can either be true or false depending on whether the substring is present or not within the string.

index refers to the position from which the search for substring will start - the default value is 0 because indexing in programming languages begins at 0. The second argument the includes() method accepts is index, and it is optional.substring is the character or the series of characters you are checking to see if they exist within string. The first argument the includes() method accepts is substring, and it is required.The includes() method accepts two arguments - one is required, and one is optional.includes() is the method you call on the word you want to search through, which in this case is string.string is the word you want to search through.The general syntax for the includes() method looks something similar to this: string.includes(substring, index) The JavaScript includes() method was introduced with ES6, and it is the most common and modern way of checking if a string contains a specific character or a series of characters. What Is The includes() Method in JavaScript? includes() Method Syntax Breakdown How to make a case-insensitive check with the includes() and indexOf() methods.How to check if a string contains a specific substring using the indexOf() method.Syntax breakdown of the indexOf() method in JavaScript.How to check if a string contains a specific substring using the includes() method.Syntax breakdown of the includes() method in JavaScript.Here is what we will cover in more detail:

How to use the built-in indexOf() JavaScript method.How to use the built-in includes() JavaScript method.In this article, you will learn two different ways you can check if a string contains a substring using JavaScript methods. Thankfully, there are a few quick ways to achieve this with JavaScript. Specifically, you might need to check whether a word contains a specific character or a specific set of characters. A substring is a string inside another string. When you're working with a JavaScript program, you might need to check whether a string contains a substring.

String includes javascript