Day 17 | JavaScript Callbacks & Higher-Order Functions | forEach, map, filter & reduce | CodeWeavers

Welcome to Day 17 of the CodeWeavers MERN Job Ready Program. Today we take the next step in understanding the power of functions in JavaScript. We already know that functions can be stored as values. Now we explore what happens when functions are passed as arguments and used to control how other functions behave. In this session, we build a practical understanding of Callbacks and Higher-Order Functions and see how they make code more reusable, flexible, and expressive. Topics covered include: Functions as Values Callbacks Functions as Arguments Higher-Order Functions Callback Execution forEach() map() filter() reduce() Processing Arrays with Functions Reusable Behaviour Array and Function Integration Common Callback Mistakes Output Prediction Real-World Applications The focus of today's class is not just learning array methods. It is understanding how functions can be used as reusable behaviour and combined with data to solve problems more effectively. This foundation will become important later when working with React, asynchronous JavaScript, APIs, event handling, and modern JavaScript development. CodeWeavers MERN Job Ready Program Batch 1 | Cohort 1 Phase 1 | Programming Foundations Day 17 | Callbacks & Higher-Order Functions Student Portal: https://codeweavers-dk.vercel.app/ What comes next? Day 18 — Lexical Scope & Closures We will explore how functions remember and access variables from their surrounding environment. If you're learning along with us: Like the session Share your biggest learning in the comments Subscribe for upcoming CodeWeavers classes Keep Learning. Keep Building. 💙 #JavaScript #Callbacks #HigherOrderFunctions #MERN #WebDevelopment #Programming #CodeWeavers #CodeUnchained