How to Find and Extract Elements Containing a Substring from an Array in JavaScript?

Advanced Substring Search Techniques in Arrays Using findIndex()

In JavaScript, searching an array for substring matches can be a multifaceted task. Consider the following scenario:

Problem: How can I search an array for a substring and retrieve the entire matching string, including the portion after the substring?

Example:

const windowArray = [ "item", "thing", "id-3-text", "class" ];

Requirement: Find the array element with "id-" in its string and extract the entire value, in this case "id-3-text".

SOLUTION:

Using findIndex() and includes()

The simplest solution leverages the ES6 higher-order method findIndex(). This method iterates through the elements of an array and returns the index of the first element that meets a specified criteria:

myArray.findIndex(element => element.includes("substring"))

Implementation:

• findIndex(): This method iterates through the array until it finds an element that meets the criteria (in this case, includes the "id-" substring).
• element: The function's parameter represents each array element.
• fat arrow (=>): Declares an anonymous function, simplifying the syntax.
• includes():: Checks if the current element contains the specified substring.

By using this method, the requested result can be retrieved accurately and efficiently.

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