Functions
Functions are reusable blocks of code. Instead of writing the same code
repeatedly, you write it once in a function and call it whenever you need it.
What You'll Learn
- Function declarations - Creating named functions
- Parameters and returns - Passing data in and getting results out
- Arrow functions - Modern, concise function syntax
- Scope - Understanding where variables are accessible
Why This Matters
Functions are the building blocks of any program. They help you:
- Avoid repetition - Write once, use many times
- Organize code - Group related logic together
- Abstract complexity - Hide details behind a simple name
- Test easily - Isolated units of code are easier to test
Think of functions as recipes: you define the steps once, then follow them
whenever you need to make that dish.
Let's learn to write our own recipes!