Unlike its companion String.includes() method, Array.includes() does not allow you to search for a fraction of an item: console.log(furniture.includes('cha')) The same applies to search strings that include blank spaces – as none of the elements of the array include a space, any search string with a blank space will return false as a result. This means that searching for “Chair” with a capital ‘C’ will return false. Similar to String.includes() above, the search method is also case-sensitive. Thus, the includes() method returns true.

In the example above the array const furniture includes the item chair. This next example demonstrates how to use the Array version of includes(): const furniture = Ĭonsole.log(furniture.includes('chair')) However, searching for the character ‘u’ with a blank space following results in includes() returning false, as this combination of characters does not exist in const str.

In the above example, searching for the character ‘u’ using includes() returns true, as the character exists in the string. This is why blank spaces count as part of the pattern to detect, and why it is possible to search for fractions of words – or even single characters, as seen below: console.log(str.includes('u')) 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. The includes() method is part of both the Array and String prototypes.

Javascript array includes