Day-5-Introducing-Functions

➡️ Day 5: Introducing Functions

Day 5 was a huge step forward! We learned how to package our code into reusable blocks called functions. This is the most important organizational tool in programming and helps us write cleaner, more efficient code by following the "Don't Repeat Yourself" (DRY) principle.

• Cheat Sheet: day_5_cheatsheet.md

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⭐ Key Concepts Covered:

• Defining and Calling: Using the def keyword to create a function and calling it by its name to execute the code.
• Parameters and Arguments: Passing information into a function to make it more flexible.
• return Values: Getting a result back from a function so the rest of our program can use it.
• Local Scope: Understanding that variables created inside a function only exist within that function.
• Advanced Concepts: Using helper functions to break down problems and a brief introduction to recursion (a function calling itself).

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💡 Highlight Snippet:

# A function that takes two numbers and returns their sum
def add(a, b):
    return a + b

# The main part of the program calls the function and uses its return value
num1 = 10
num2 = 5
sum_result = add(num1, num2) # The returned value (15) is stored here

print(f"The sum is: {sum_result}")