JavaScript String includes() method

The includes() method in JavaScript is used to check whether a string contains a specified substring. This method takes a single argument, which is the substring to search for in the string. If the substring is found, the includes() method returns true. If the substring is not found, the includes() method returns false.

Here is an example of how the includes() method works:

const string1 = 'Hello, world!';

const result = string1.includes('world');

// the result will be: true

In the code example above, we first declare a string called string1 that contains the text Hello, world!. We then use the includes() method to check if the string1 string contains the substring world. The includes() method takes a single argument, which is the substring to search for in the string. In this case, we pass in the string world as the argument to the includes() method.

As a result of calling the includes() method, the result variable will be set to true, because the string1 string does indeed contain the substring world. If the string1 string did not contain the substring world, the result variable would be set to false.

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