Introduction to JavaScript String includes() method

The includes() method determines whether a string contains another string:

Code language: CSS (css)

The includes() method returns true if the searchString found in the string; otherwise false.

The optional position parameter specifies the position within the string at which to begin searching for the searchString. The position defaults to 0.

The includes() matches string case-sensitively.

JavaScript String includes() examples

This example uses the includes() method to check if the string @ is in the string 'admin@example.com':

Code language: JavaScript (javascript)

Output:

Code language: JavaScript (javascript)

The following example checks if the str contains the Script:

Code language: JavaScript (javascript)

Output:

Code language: JavaScript (javascript)

As mentioned earlier, the includes() matches the string case-sensitively, therefore, the following example returns false:

Code language: JavaScript (javascript)

Output:

Code language: JavaScript (javascript)

The following example uses the includes() method with the second parameter:

Code language: JavaScript (javascript)

Output:

Code language: JavaScript (javascript)

In this tutorial, you have learned how to use the JavaScript String includes() method to determine whether a string contains another string.