Named list elements in R Programming - Mini Project: Build & Apply

Named list elements

📖 Scenario: Imagine you are organizing a small collection of fruits with their quantities. You want to keep track of each fruit by name and how many you have.

🎯 Goal: You will create a named list in R where each fruit name is linked to its quantity. Then you will access and display this information.

📋 What You'll Learn

Create a named list with exact fruit names and quantities

Create a variable to hold the name of a fruit to look up

Use the variable to get the quantity from the named list

Print the quantity of the chosen fruit

💡 Why This Matters

🌍 Real World

Named lists help organize data by labels, like keeping track of items and their counts in a store or kitchen.

💼 Career

Understanding named lists is useful for data analysis, reporting, and programming tasks where you need to label and access data clearly.

1

Create a named list of fruits

Create a named list called fruits with these exact entries: apple = 5, banana = 3, orange = 7

R Programming

# Create the named list called fruits
# Your code here

Need a hint?

Use the list() function with names and values separated by =.

2

Create a variable for the fruit name

Create a variable called chosen_fruit and set it to the string "banana"

R Programming

fruits <- list(apple = 5, banana = 3, orange = 7)
# Create the variable chosen_fruit with value "banana"
# Your code here

Need a hint?

Use the assignment operator <- to assign the string "banana" to chosen_fruit.

3

Get the quantity of the chosen fruit

Create a variable called quantity that gets the value from fruits using the name stored in chosen_fruit

R Programming

fruits <- list(apple = 5, banana = 3, orange = 7)
chosen_fruit <- "banana"
# Get the quantity of the chosen fruit from fruits
# Your code here

Need a hint?

Use double square brackets [[ ]] with the variable chosen_fruit to access the list element.

4

Print the quantity

Write a print() statement to display the value of quantity

R Programming

fruits <- list(apple = 5, banana = 3, orange = 7)
chosen_fruit <- "banana"
quantity <- fruits[[chosen_fruit]]
# Print the quantity
# Your code here

Need a hint?

Use print(quantity) to show the number.