FAQ: Banking on Ruby - Making a Withdrawal

This community-built FAQ covers the “Making a Withdrawal” exercise from the lesson “Banking on Ruby”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Learn Ruby

FAQs on the exercise Making a Withdrawal

There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply (reply) below.

If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.

Join the Discussion. Help a fellow learner on their journey.

Ask or answer a question about this exercise by clicking reply (reply) below!

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources? Head here.

Looking for motivation to keep learning? Join our wider discussions.

Learn more about how to use this guide.

Found a bug? Report it!

Have a question about your account or billing? Reach out to our customer support team!

None of the above? Find out where to ask other questions here!

Why doesn’t it seem to be possible to pass this exercise when using “? and :” instead of an “if, else, end” statement?

It is because the true condition has two elements “@balance” and “puts”?

If it is possible to use the “? and :” notation, could someone post their code?

“? and :” can only return the value of an expression.
“? and :” cannot replace all if/else statements, only ones that return one value if a given condition is true and another otherwise.

I found the following example on Stack Overflow found here-

Their question is a lot like your question: How do you make a "multiline ternary expression’.

This solution was offered:

condition ? (expression1 line 1; expression1 line 2; expression1 line 3) : expression2

However, the following caution was repeated by multiple users:

You should keep in mind that this reduces readability of your code. You are probably better off using an if / else statement to improve readability.

I went to used the ternary operator in the exercise just to see what it looked like, and how it worked.

def withdraw(amount, pin_number)
pin_number == pin ?
(@balance -= amount;
puts “Withdrew #{amount}. New balance: $#{@balance}.”):
(puts pin_error)

I went and made the same method using an if/else statement just to see what the folks on Stack Overflow were talking about:

def withdraw(amount, pin_number)
    if pin_number == pin
      @balance -= amount
      puts "Withdrew #{amount}. New balance: $#{@balance}."
      puts pin_error

It does look a bit more straightforward with the if/else statement. I think the main difference is instead of using the symbols ? and : the words ‘if’ and ‘else’ are in their place. For me, this lends a lot to understanding the code more easily.

1 Like