📋 Functions Explained Like You're 5

A recipe card you can reuse

Day 22 of 149

👉 Full deep-dive with code examples

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The Recipe Card

Your mom has a recipe card for chocolate chip cookies.

Every time she wants cookies:

1. She doesn't reinvent the recipe
2. She just follows the card
3. Same steps, same delicious cookies!

Functions are recipe cards for code!

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In Code

Instead of writing the same thing over and over:

# The recipe (function)
def make_greeting(name):
    return "Hello, " + name + "!"

# Use it anytime!
make_greeting("Alex")   # "Hello, Alex!"
make_greeting("Sam")    # "Hello, Sam!"

Write once, use many times!

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The Magic

Functions can:

• Take inputs (ingredients)
• Do something (the recipe steps)
• Give output (the finished dish)

Input: name
Process: add "Hello" before it
Output: greeting

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In One Sentence

Functions are reusable blocks of code that take inputs, do something, and return outputs.

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