Implicit return (last expression) in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does implicit return mean in Ruby methods?

In Ruby, the last expression evaluated in a method is automatically returned without needing the return keyword.

beginner

Consider this Ruby method:<br>

def add(a, b)
  a + b
end

<br>What will add(2, 3) return?

It returns 5 because the last expression a + b is implicitly returned.

beginner

True or False: In Ruby, you must always use the return keyword to send a value back from a method.

False. Ruby automatically returns the last evaluated expression from a method, so return is optional.

intermediate

How does implicit return help make Ruby code cleaner?

It reduces the need for extra return statements, making code shorter and easier to read.

intermediate

What happens if you use return before the last expression in a Ruby method?

The method immediately returns the value after return, skipping any code after it.

In Ruby, what does a method return if there is no explicit return statement?

A The last evaluated expression

B nil

C An error

D The first expression

Ruby methods automatically return the value of the last expression evaluated.

What will this Ruby method return?<br>

def greet
  "Hello"
  "Hi"
end

A "Hello"

B "Hi"

C nil

D An error

The last expression "Hi" is returned implicitly.

Which keyword can you use to return a value early from a Ruby method?

A return

B break

C exit

D yield

The return keyword immediately exits the method and returns a value.

If a Ruby method ends with 42, what is returned?

A An error

B nil

C 0

D 42

The last expression, here the number 42, is implicitly returned.

Why might you choose to use an explicit return in Ruby?

A Because implicit return is not supported

B To make code longer

C To return early before the last expression

D To cause an error

Explicit return lets you exit a method early with a value.

Explain what implicit return means in Ruby and how it affects writing methods.

Think about what happens if you leave out the return keyword.

Describe a situation where you would use an explicit return in a Ruby method instead of relying on implicit return.

When you want to stop the method before the last line.