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1. JavaScript Functions
An Overview of Functions in
JavaScript

2. Introduction to Functions
• • Functions are reusable blocks of code.
• • They help organize code and avoid
repetition.
• • Functions can accept inputs and return
outputs.

3. Function Syntax
• Basic syntax:
• function functionName(parameters) {
• // code to be executed
• return value;
• }

4. Types of Functions
• • Named Functions
• • Anonymous Functions
• • Arrow Functions
• • Function Expressions

5. Arrow Functions
• • Introduced in ES6.
• • Shorter syntax for writing functions.
• Example:
• const add = (a, b) => a + b;

6. Parameters and Arguments
• • Parameters: placeholders for input values.
• • Arguments: actual values passed to a
function.
• • Default Parameters: functions can have
default values.

7. Return Statement
• • Functions can return a value using the
'return' keyword.
• • Returning ends function execution.
• • A function without return returns
'undefined'.

8. Function Scope
• • Global Scope: accessible everywhere.
• • Local Scope: accessible only inside the
function.
• • Block Scope (with let/const).

9. Conclusion
• • Functions are fundamental building blocks in
JavaScript.
• • They improve code reusability and
readability.
• • Understanding functions is essential for JS
development.