D.R.Y. 10 XP Easy

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Welcome to Chapter 6: Functions! 🔧

D.R.Y. stands for Don't Repeat Yourself — one of the most important rules in programming!

💡 Think of it like this: A function is like a recipe. You write the recipe once, and then you can use it over and over again. Instead of writing the same code 10 times, you put it in a function and call it 10 times!

# Without functions (BAD — repeating code!):
print('Hello, Alice!')
print('Welcome to CodeRex!')
print('Hello, Bob!')
print('Welcome to CodeRex!')

# With functions (GOOD — write once, use many!):
def greet(name):
    print(f'Hello, {name}!')
    print('Welcome to CodeRex!')

greet('Alice')
greet('Bob')

Key parts of a function:

def — the keyword that says "I'm creating a function"
Function name — what you call it (use lowercase with underscores)
Parameters — values you pass in (inside the parentheses)
Body — the indented code inside the function
return — optionally send a value back (we'll learn this next!)

def greet(name):          # name is a parameter
    print(f'Hello, {name}!')

greet('Alice')            # 'Alice' is an argument
greet('Bob')              # 'Bob' is an argument

📋 Instructions

Create a function called `welcome` that takes a `name` parameter and prints a welcome message. Then call it 3 times with different names: ``` Welcome, Alice! Welcome, Bob! Welcome, Charlie! ```

def welcome(name): then print(f'Welcome, {name}!'). Call it three times. You've got this — take it step by step!

⚠️ Try solving it yourself first — you'll learn more!

# Without functions (BAD — repeating code!):
print('Hello, Alice!')
print('Welcome to CodeRex!')
print('Hello, Bob!')
print('Welcome to CodeRex!')

# With functions (GOOD — write once, use many!):
def greet(name):
    print(f'Hello, {name}!')
    print('Welcome to CodeRex!')

greet('Alice')
greet('Bob')

🧪 Test Cases

Input

Run your code

Expected

Welcome, Alice!
Welcome, Bob!
Welcome, Charlie!

Expected program output

← Previous Next Exercise →

main.py

Hi! I'm Rex 👋

Output

Ready. Press ▶ Run or Ctrl+Enter.

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