module4.md

Module 4: Functions

Activity 1: Introduction to functions

• Understanding the concept of functions and their importance in programming.
• Exploring the syntax of function declaration and function definitions.
• Learning about function names and best practices for naming functions.
• Understanding the purpose of function documentation and comments.

Activity 2: Declaring and calling functions

• Declaring functions with parameters and return statements.
• Calling functions and passing arguments.
• Understanding function scope and variable visibility.
• Exploring function hoisting and function expressions.

Activity 3: Parameters and return values

• Working with function parameters and understanding their role in passing data to functions.
• Exploring different types of function parameters: required parameters, default parameters, and variable-length parameters.
• Using return statements to return values from functions.
• Understanding the concept of function purity and side effects.

Practice Exercises:

1. Calculate the area of a circle:

   • Write a function called calculate_area that takes the radius of a circle as a parameter.
   • Inside the function, calculate the area of the circle using the formula: area = 3.14159 * radius * radius.
   • Return the calculated area from the function.
   • Call the function with different radius values and print the result.

2. Reverse a string:

   • Write a function called reverse_string that takes a string as a parameter.
   • Inside the function, reverse the order of characters in the string.
   • Return the reversed string from the function.
   • Call the function with different strings and print the result.

3. Check if a number is prime:

   • Write a function called is_prime that takes a number as a parameter.
   • Inside the function, check if the number is prime (i.e., divisible only by 1 and itself).
   • Return True if the number is prime, and False otherwise.
   • Call the function with different numbers and print the result.

Estimated time to complete this module is approximately 4-6 hours.

To further enhance your learning, here are some additional resources:

• Python Documentation on Functions: https://docs.python.org/3/tutorial/controlflow.html#defining-functions
• Real Python's Introduction to Python Functions: https://realpython.com/defining-your-own-python-function/
• FreeCodeCamp's Python Functions: https://www.freecodecamp.org/learn/scientific-computing-with-python/python-for-everybody/python-functions