--- title: "Ashlyn Joshy (@AshlynJoshy) | Hashnode" description: "Computer Science Engineer. Read the latest articles by Ashlyn Joshy on Hashnode." url: "https://hashnode.com/@AshlynJoshy" --- @AshlynJoshy # Ashlyn Joshy @AshlynJoshy · Kerala, India · Joined August 2024 Computer Science Engineer ### [The Scope Chain, Scope & Lexical Environment](https://ashlynjoshy.hashnode.dev/the-scope-chain-scope-lexical-environment?utm_source=hashnode&utm_medium=feed) The ideas of scope, scope chain, and lexical environment are crucial to JavaScript. We are familiar with these terminologies, yet their responsibilities can be unclear at times. Let's explore more to see how they operate together. Scope in Javascript... 3 min read · [ashlynjoshy.hashnode.dev](https://ashlynjoshy.hashnode.dev/the-scope-chain-scope-lexical-environment?utm_source=hashnode&utm_medium=feed) [Sep 18, 2024](https://hashnode.com/posts/the-scope-chain-scope-lexical-environment/66eab06343e7a144d322ae40) ### [Undefined Vs Not Defined in Javascript](https://ashlynjoshy.hashnode.dev/undefined-vs-not-defined-in-javascript?utm_source=hashnode&utm_medium=feed) When working with JavaScript, you might run into the terms not defined and undefined. While they may sound identical, they represent different situations in JavaScript programming. In phase one memory allocation, the Js will assign each variable a pl... 1 min read · [ashlynjoshy.hashnode.dev](https://ashlynjoshy.hashnode.dev/undefined-vs-not-defined-in-javascript?utm_source=hashnode&utm_medium=feed) [Sep 17, 2024](https://hashnode.com/posts/undefined-vs-not-defined-in-javascript/66e96da41c0cb304c48699ec) ### [map(), filter(), and reduce() in Javascript](https://ashlynjoshy.hashnode.dev/map-filter-and-reduce-in-javascript?utm_source=hashnode&utm_medium=feed) In JavaScript, map, filter, and reduce are powerful array methods that allow you to manipulate and transform arrays efficiently. Each method iterates over the elements of an array, applies an operation, and returns a new array based on that. Map Func... 3 min read · [ashlynjoshy.hashnode.dev](https://ashlynjoshy.hashnode.dev/map-filter-and-reduce-in-javascript?utm_source=hashnode&utm_medium=feed) [Sep 2, 2024](https://hashnode.com/posts/map-filter-and-reduce-in-javascript/66d5830fe840bd47aa3db491)