Hello readers 👋, welcome to the 24th blog in this JavaScript series! Last time we explored the clever spread and rest operators, learning how the same three dots can either unpack or collect data. Today we are shifting gears to a topic that deeply sharpens your understanding of how JavaScript works under the hood: string polyfills and common interview methods . Have you ever wondered how "hello".includes("ell") works inside the engine? Or how you could make the same behavior work in an old browser that doesn't support includes ? That's exactly what we are going to dive into. We will not just use string methods, we will build several of them from scratch, understand the logic, and then solve some classic interview string problems. Let's get our hands dirty. What string methods are In JavaScript, every string is a primitive value, but when you access a property or method on it, the engine wraps it in a String object behind the scenes.…