Functions in JavaScript

Imagine you have a recipe for making a sandwich. Instead of explaining the steps every time someone wants a sandwich, you write the recipe once and anyone can follow it. Functions work the same way!

A function is a reusable set of instructions that:

• •Has a name (so you can use it later)
• •Can accept inputs (called parameters)
• •Performs a specific task
• •Can return a result

Basic function structure: function functionName(parameter1, parameter2) { // Instructions go here return result; // Optional }

Calling (using) a function: functionName(value1, value2);

Special feature of function declarations:

• •You can use them before they appear in your code (hoisting)
• •They have clear names that describe what they do
• •Perfect for main tasks in your program

Think of functions as your personal assistants - you tell them what to do once, and they'll do it whenever you ask!