JAVASCRIPT

How to Check if a Substring is in a String in JavaScript Using the includes() Method

// Here's what the syntax looks like:
// string.includes(substring, fromIndex)

// Here's an example:

const bio = "I am a web developer";
console.log(bio.includes("web"));
// true

javascript - How do I check if string contains substring?

if (str.toLowerCase().indexOf("yes") >= 0)