Functions

Summary

Reusable blocks of code — declared via function declarations, expressions, or arrow functions — each with subtly different behavior around `this` and hoisting. Functions are first-class values in JavaScript, so they can be stored, passed around, returned, and composed into larger behaviors.

• 1Write the same function as a declaration, expression and arrow function. Validate your understanding by applying it in a small practical example.
• 2Learn default parameters and rest parameters (`...args`). Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Understand arrow functions don't have their own `this`.