Web Reference: Learn how to use the includes() method to check if a string contains a specified string. See examples, syntax, parameters, return value and browser support for this ECMAScript6 feature. The includes() method of String values performs a case-sensitive search to determine whether a given string may be found within this string, returning true or false as appropriate. 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 the specified value. Returns false if the value is not found. It is case-sensitive, so uppercase and lowercase letters are treated differently.
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