How Can I Check if a String Contains a Substring in JavaScript?

Checking for Substrings in Strings: Exploring JavaScript Methods

In JavaScript, the absence of a dedicated String.contains() method can raise questions about how to effectively determine whether one string contains another. Let's delve into a practical solution.

Method: String.prototype.includes

Modern JavaScript (ECMAScript 6 onwards) offers a clean and straightforward method for checking substrings: String.prototype.includes. This method takes a target substring as an argument and returns a Boolean value:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring)); // true

The output will be "true" because the substring "oo" is contained within the string "foo". This method is efficient and provides a clear indication of substring presence.

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