Lesson 12
Functions
Functions help you write reusable code. They allow you to break down a problem into smaller, reusable blocks.
- What is a Function?
- Function Declaration
- Function Expression
- Parameters & Arguments
- Return Statement
- Scope in Functions
- Arrow Functions
A function is a block of code designed to perform a particular task. You can call (invoke) it whenever you need.
Reusable
Write once, use many times.
Organized
Break complex problems into smaller parts.
Maintainable
Easy to test and debug.
JavaScript
Output
Your output will appear here...
// Declarationfunction name(param1, param2) { // code return value; // optional}// Callname(arg1, arg2);
A function can return only one value. If you don’t return anything, it returns undefined.
- Functions reduce code repetition.
- Use parameters to make functions dynamic.
- Use return to send a value back.
- Functions create their own scope.