How to Find the Index of an Element Containing a Substring in a JavaScript Array?

Searching Arrays for Substrings

In JavaScript, it is possible to search an array for elements that contain a specified substring. This can be useful when working with complex strings that have multiple components. To search for a substring within an array, you can use a simple yet effective approach:

Using findIndex()

Unlike some complex solutions, findIndex() offers an elegant and efficient method for searching arrays:

<code class="js">myArray.findIndex(element => element.includes("substring"));</code>

How it Works:

• findIndex() is a native JavaScript method that iterates through an array's elements.
• The provided function, represented by the fat arrow syntax, specifies the search criteria.
• includes() checks if the current array element contains the substring you are searching for.

In the provided example, this approach will return the index of the first element in windowArray that contains the substring "id-". It will also correctly retrieve the full string, such as "id-3-text", as part of the matching element.

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