Function Declaration vs Function Expression What’s the Difference

Understanding Function Declarations vs Function Expressions in JavaScript While writing a blog about Arrow Functions , I kept seeing two terms appear everywhere: Function Declaration Function Expression That made me pause and ask: What exactly are these? And why do they matter? If you are learning JavaScript, you will encounter these concepts very early. Understanding them will make it much easier to learn arrow functions, callbacks, and modern JavaScript patterns . In this blog, we’ll break everything down in a beginner-friendly way. Topics Covered In this guide we will learn: What functions are and why we need them The difference between parameters and arguments Function Declarations Function Expressions Key differences between them When to use each type What Are Functions? Functions are one of the fundamental building blocks of JavaScript . A function is simply a reusable block of code designed to perform a specific task . Instead of writing the same code again and again, we can put