Method declaration with def in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What keyword is used to declare a method in Ruby?

The keyword def is used to declare a method in Ruby.

beginner

How do you end a method declaration in Ruby?

You end a method declaration with the keyword end.

beginner

What is the correct way to declare a method named greet that prints 'Hello'?

Use:<br>

def greet
  puts 'Hello'
end

intermediate

Can Ruby methods return values? How?

Yes, Ruby methods return the value of the last executed expression automatically.

intermediate

What happens if you call a method without parentheses in Ruby?

Ruby allows calling methods without parentheses if there are no arguments, making code look cleaner.

Which keyword starts a method declaration in Ruby?

A def

B function

C method

D declare

In Ruby, def is the keyword used to start a method declaration.

How do you end a method declaration in Ruby?

A stop

B end

C finish

D close

Ruby uses the keyword end to close blocks including method declarations.

What will this Ruby method return?<br>

def add
  2 + 3
end

A 5

B 2 + 3

C nil

D Error

Ruby methods return the last evaluated expression automatically, so this returns 5.

Which of these is a valid method call in Ruby?

A greet()

B greet

C None

D Both A and B

Ruby allows calling methods with or without parentheses if there are no arguments.

What is the output of this code?<br>

def say_hi
  puts 'Hi!'
end
say_hi

A say_hi

B nil

C Hi!

D Error

The method prints 'Hi!' to the screen when called.

Explain how to declare a simple method in Ruby using def and end.

Think about the start and end keywords and what goes in between.

Describe how Ruby methods return values and how you can call them.

Remember Ruby's automatic return and flexible syntax.