The includes() method searches strings using character combination matches. Blank spaces are also taken into account when searching a String or an Array.

Searching for “Includes” with a capital I will return false. Important: includes() is case sensitive!!

As the value of const str contains the search string (included as the character combination i-n-c-l-u-d-e-s), the method returns true. In the example above, the includes() method is used to search the string variable const str for the word “ includes”. The following example demonstrates basic usage of includes() when working with a String: const str = 'This String includes the word includes' This article introduces the basics of the includes() method for each prototype, as well as exploring the differences between the two. This method accepts a search value as a parameter, and returns true if the value is either contained in the array on which it is called, or if it exists as a substring of the string object on which it is called. Use () only.The includes() method is part of both the Array and String prototypes. Later, MooTools 1.5+ changed the signature to match the ES6 standard. However, you should note that MooTools 1.3 signature and ECMAScript 6 signatures for this method differ (on the second argument). MooTools 1.3 forces its own version of (), so websites relying on it should not break. As a result, the implementation was disabled in Firefox 17 and () was available one version later, in Firefox 18, when outreach to MooTools was leading to the release of MooTools version 1.2.6. With the introduction of this function in Firefox 17, the behavior of that check changed in a way that causes code based on MooTools' () implementation to break.

This version of MooTools checks whether () exists and, if it doesn't, MooTools adds its own function. It's been reported that some websites using MooTools 1.2 broke on Firefox 17. It was renamed to includes() in bug 1102219 due to the following reason: In Firefox 18 - 39, the name of this method was contains().

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