R6 classes in R Programming - Mini Project: Build & Apply

Create and Use an R6 Class in R

📖 Scenario: You want to organize information about a simple bank account using an R6 class in R. This will help you keep track of the account owner's name and the current balance.

🎯 Goal: Build an R6 class called BankAccount with fields for owner and balance, a method to deposit money, and a method to get_balance that returns the current balance.

📋 What You'll Learn

Create an R6 class named BankAccount with fields owner and balance

Add a method deposit that adds an amount to balance

Add a method get_balance that returns the current balance

Create an instance of BankAccount with owner 'Alice' and balance 100

Deposit 50 into the account

Print the current balance using get_balance

💡 Why This Matters

🌍 Real World

Using R6 classes helps organize data and behavior together, like managing bank accounts or other objects with properties and actions.

💼 Career

Understanding R6 classes is useful for R programmers who want to write clean, reusable, and organized code in data science, software development, or automation.

1

Create the R6 class with fields

Write code to load the R6 package and create an R6 class called BankAccount with public fields owner and balance. Initialize owner and balance in the initialize method.

R Programming

library(R6)
# Create the BankAccount R6 class with owner and balance fields
# Your code here

Need a hint?

Use R6Class to create the class. Define owner and balance as public fields and set them in initialize.

2

Add deposit and get_balance methods

Add two public methods to the BankAccount class: deposit that takes an amount and adds it to balance, and get_balance that returns the current balance.

R Programming

library(R6)

BankAccount <- R6Class("BankAccount",
  public = list(
    owner = NULL,
    balance = NULL,
    initialize = function(owner, balance) {
      self$owner <- owner
      self$balance <- balance
    },
    # Add deposit method here
    # Add get_balance method here
  )
)
# Your code here

Need a hint?

Define deposit to add amount to self$balance. Define get_balance to return self$balance.

3

Create an instance and deposit money

Create an object called account from the BankAccount class with owner set to 'Alice' and balance set to 100. Then call the deposit method on account to add 50.

R Programming

library(R6)

BankAccount <- R6Class("BankAccount",
  public = list(
    owner = NULL,
    balance = NULL,
    initialize = function(owner, balance) {
      self$owner <- owner
      self$balance <- balance
    },
    deposit = function(amount) {
      self$balance <- self$balance + amount
    },
    get_balance = function() {
      return(self$balance)
    }
  )
)

# Create account object with owner 'Alice' and balance 100
# Deposit 50 into account
# Your code here

Need a hint?

Use BankAccount$new("Alice", 100) to create the object. Use account$deposit(50) to add money.

4

Print the current balance

Use the get_balance method on the account object to print the current balance.

R Programming

library(R6)

BankAccount <- R6Class("BankAccount",
  public = list(
    owner = NULL,
    balance = NULL,
    initialize = function(owner, balance) {
      self$owner <- owner
      self$balance <- balance
    },
    deposit = function(amount) {
      self$balance <- self$balance + amount
    },
    get_balance = function() {
      return(self$balance)
    }
  )
)

account <- BankAccount$new("Alice", 100)
account$deposit(50)

# Print the current balance using get_balance
# Your code here

Need a hint?

Use print(account$get_balance()) to show the balance.