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80 interview questions on Rubyfor developers (2026)

Test your technical skills before an interview of Ruby with 80 corrected questions. Beginner, Intermediate or Expert level.

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Expert
2 votes339 runs0 comment

What is the output of the following code? class Person attr_accessor :name end person = Person.new person.name = 'John' puts person.name

Back-end developer
ruby
attr_accessor
Hivebriteat Nov 29, 2021
Easy
1 vote341 runs0 comment

What is the output of the following Ruby code? `numbers = [1, 2, 3, 4, 5]` `numbers.each { |n| puts n }` `numbers.map { |n| puts n }`

Back-end developer
array
map
Hivebriteat Nov 29, 2021
Easy
1 vote325 runs0 comment

How to add a key-value pair to a hash in Ruby

Back-end developer
hash
ruby
Hivebriteat Nov 29, 2021
Hard
1 vote307 runs0 comment

How to change the value of a string in Ruby

Back-end developer
strings
errors
Hivebriteat Nov 29, 2021
Hard
1 vote304 runs0 comment

What is the output of the following code? class A def method1 puts 'method1' end private def method3 puts 'method3' end end obj = A.new obj.method1 obj.method3

Back-end developer
ruby
methods
Hivebriteat Nov 29, 2021
Easy
1 vote71 runs0 comment

What is the output of the following Ruby code? `1..5.to_a`

Back-end developer
range
Olivier Millaat Nov 16, 2021
Medium
0 vote332 runs0 comment

Which of the following Ruby code blocks will print 1, 2, 3?

Back-end developer
loops
arrays
Hivebriteat Nov 29, 2021
Easy
0 vote331 runs0 comment

Write a Ruby program that prints the sum of two numbers

Back-end developer
variables
assignment
Hivebriteat Nov 29, 2021
Easy
0 vote324 runs0 comment

Add the string 'toto' to an array in Ruby

Back-end developer
array
ruby
Hivebriteat Nov 29, 2021
Medium
0 vote320 runs
1 comment

What is the difference between include, extend and prepend in Ruby?

Back-end developer
modules
classes
Hivebriteat Nov 29, 2021
Hard
0 vote319 runs0 comment

Return the instance methods common to String, Integer and Array, returns an array

Back-end developer
methods
array
Hivebriteat Mar 3, 2023
Easy
0 vote316 runs0 comment

How to get the first 3 elements of an array in Ruby

Back-end developer
array
range
Hivebriteat Nov 29, 2021
Hard
0 vote311 runs
2 comments

Call a method only if the caller is not null.,Does the same thing as `@my_object.try!(:my_method)`.

Back-end developer
ruby
method
Hivebriteat Nov 29, 2021
Medium
0 vote309 runs0 comment

How to create a block in Ruby

Back-end developer
block
lambda
Hivebriteat Nov 29, 2021
Expert
0 vote309 runs
1 comment

Define a class foobar that inherits from Array and has a method foo.

Back-end developer
classes
inheritance
Hivebriteat Nov 29, 2021
Hard
0 vote307 runs0 comment

How to use blocks in Ruby

Back-end developer
blocks
Hivebriteat Jan 20, 2023
Medium
0 vote307 runs0 comment

A Ruby library that makes it easy to write concurrent code without having to worry about thread safety.

Back-end developer
ruby
parallelism
Hivebriteat Nov 29, 2021
Hard
0 vote305 runs0 comment

The `super` keyword calls the superclass method with the same parameters. If the superclass method cannot raise exceptions, `super` will not raise them either.

Back-end developer
exceptions
super
Hivebriteat Jan 16, 2023
Medium
0 vote304 runs0 comment

Which Ruby libraries are used for background processing?

Back-end developer
queues
background jobs
Hivebriteat Nov 29, 2021
Easy
0 vote304 runs0 comment

How to add a gem to a Ruby project?

Back-end developer
gemfile
ruby
Hivebriteat Nov 29, 2021
Ruby tests