Function definition in R Programming - Mini Project: Build & Apply

Function definition

📖 Scenario: You are helping a small bakery keep track of how many cookies they bake each day. They want to use a simple function to calculate the total cookies baked over several days.

🎯 Goal: Create a function in R that adds two numbers representing cookies baked on two different days, then use it to find the total cookies baked.

📋 What You'll Learn

Create a function called add_cookies that takes two parameters: day1 and day2.

The function should return the sum of day1 and day2.

Create two variables cookies_day1 and cookies_day2 with values 50 and 70 respectively.

Call the function add_cookies with cookies_day1 and cookies_day2 as arguments and store the result in total_cookies.

Print the value of total_cookies.

💡 Why This Matters

🌍 Real World

Bakeries and small businesses often need simple calculations to track daily production or sales. Functions help automate these calculations.

💼 Career

Understanding how to define and use functions is a key skill for data analysis, automation, and software development jobs.

1

Create variables for cookies baked on two days

Create two variables called cookies_day1 and cookies_day2 and set them to 50 and 70 respectively.

R Programming

# Create variables cookies_day1 and cookies_day2 with values 50 and 70
# Your code here

Need a hint?

Use the assignment operator <- to assign values to variables.

2

Define the function to add cookies

Define a function called add_cookies that takes two parameters: day1 and day2. The function should return the sum of day1 and day2.

R Programming

cookies_day1 <- 50
cookies_day2 <- 70

# Define the function add_cookies(day1, day2) that returns day1 + day2
# Your code here

Need a hint?

Use function keyword to define a function in R.

3

Call the function and store the result

Call the function add_cookies with cookies_day1 and cookies_day2 as arguments and store the result in a variable called total_cookies.

R Programming

cookies_day1 <- 50
cookies_day2 <- 70

add_cookies <- function(day1, day2) {
  return(day1 + day2)
}

# Call add_cookies with cookies_day1 and cookies_day2 and save to total_cookies
# Your code here

Need a hint?

Call the function by writing its name followed by parentheses with arguments inside.

4

Print the total cookies baked

Write a line to print the value of total_cookies.

R Programming

cookies_day1 <- 50
cookies_day2 <- 70

add_cookies <- function(day1, day2) {
  return(day1 + day2)
}

total_cookies <- add_cookies(cookies_day1, cookies_day2)

# Print total_cookies
# Your code here

Need a hint?

Use the print() function to show the value on the screen.