Description The includes() method returns true if a string contains a specified string. Otherwise it returns false. The includes() method is case sensitive.

Jul 10, 2025 · Thrown if searchString is a regex. This method lets you determine whether or not a string includes another string. The includes() method is case sensitive. For example, the following …

Nov 24, 2009 · Usually I would expect a String.contains () method, but there doesn't seem to be one. What is a reasonable way to check for this?

Jan 16, 2026 · The includes () method is used to check whether a string contains a specific value. It returns a boolean result based on whether the text is found or not. Returns true if the string contains …

Nov 5, 2021 · In JavaScript you can use the .includes() method to see if one string is found in another. But how does it work exactly? In this article, I will walk you through a few code examples of the …

Dec 5, 2025 · Learn how to check if a string contains a specific value in JavaScript using includes (), indexOf (), and regex. Simple examples for beginners.

Checking for a substring is a simple but essential task in JavaScript. The key takeaways are: The .includes() method is the modern, recommended best practice. It is clear, readable, and returns a …

In this tutorial, you will learn how to use the JavaScript String includes () method to check if a string contains a substring.

In JavaScript, includes () is a string method that determines whether a substring is found in a string. Because the includes () method is a method of the String object, it must be invoked through a …

Learn how to use the JavaScript String includes () method to check if a string contains a specified substring. Explore syntax, examples, and practical applications.