How to check whether a string contains a substring in JavaScript

Question

There doesn't seem to be a String.contains() function, which is what I would normally anticipate.

What is an appropriate technique to verify this?

Answer 1

You can check whether a string contains a substring in JavaScript using the includes() method or by using the indexOf() method. Here's how you can do it:

Using includes() method:

let myString = "Hello, world!";
let substring = "world";

if (myString.includes(substring)) {
    console.log("Substring found!");
} else {
    console.log("Substring not found.");
}