Ruby & Rails Online Test

Q: What are the main coding tests?

Some of the main coding tests include: JavaScript Online Test Python Online Test Java Online Test

The Ruby & Rails Online Test uses scenario-based MCQs to evaluate candidates on their proficiency in the Ruby programming language and the Rails web framework. The test assesses candidates' understanding of topics such as object-oriented programming, model-view-controller architecture, ActiveRecord, routing, migrations, and RESTful APIs. Candidates are evaluated on their ability to use Ruby and Rails to develop scalable and maintainable web applications, as well as their proficiency in using Ruby gems, tools, and libraries to solve common programming problems.

Covered skills:

Ruby Basics
Ruby OOPs
Rails Fundamentals
Rails MVC
REST APIs in Rails
Ruby Coding

Get started for free

Preview questions

About the Ruby & Rails Test

The Ruby & Rails Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Proficient in Ruby Basics
Strong understanding of Ruby OOPs
Familiar with Rails Fundamentals
Knowledgeable in Rails MVC
Able to build REST APIs in Rails
Proficient in Ruby Coding
Skilled in efficiently handling exceptions and errors
Ability to use object-oriented programming concepts in Ruby
Capable of developing web applications using Rails
Able to design and implement RESTful APIs in Rails

1200+ customers in 80 countries

Use Adaface tests trusted by recruitment teams globally. Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

Get started for free

Preview questions

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 15,000+ questions. The actual questions on this Ruby & Rails Test will be non-googleable.

🧐 Question
Easy Arrays Strings Arrays Strings	Solve
Check the following Ruby code: We want the following execution result: - Commit - PR - Merge What should we replace __BLOCK__ with to achieve this?
Medium Class and Self OOPs	Solve
What is the execution result of the following Ruby code?
Easy Exceptions Exceptions OOPs Syntax Exception Handling	Solve
What is the result of following Ruby code:
Medium New Class OOPs Singleton	Solve
Check the following Ruby code: Which all of the following statements should replace __BLOCK__ to have "Marvel" as execution result? A: Sample.new.class.ciao B: Sample.class.new.ciao C: Sample.new.ciao D: Sample.ciao
Hard Movie query problem Eager Loading N+1 Query Issue	Solve
Our intern created the following model scope and they want to use in this view: Which of these code snippets they use to fetch the correct results, and avoid the N+1 query issue?
Easy Registration Queue Logic Queues Sorting By Custom Order	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic String Parsing Character Counting	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Easy Arrays Strings Arrays Strings	2 mins Ruby	Solve
Check the following Ruby code: We want the following execution result: - Commit - PR - Merge What should we replace __BLOCK__ with to achieve this?
	Medium Class and Self OOPs	2 mins Ruby	Solve
What is the execution result of the following Ruby code?
	Easy Exceptions Exceptions OOPs Syntax Exception Handling	2 mins Ruby	Solve
What is the result of following Ruby code:
	Medium New Class OOPs Singleton	2 mins Ruby	Solve
Check the following Ruby code: Which all of the following statements should replace __BLOCK__ to have "Marvel" as execution result? A: Sample.new.class.ciao B: Sample.class.new.ciao C: Sample.new.ciao D: Sample.ciao
	Hard Movie query problem Eager Loading N+1 Query Issue	4 mins Rails	Solve
Our intern created the following model scope and they want to use in this view: Which of these code snippets they use to fetch the correct results, and avoid the N+1 query issue?
	Easy Registration Queue Logic Queues Sorting By Custom Order	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic String Parsing Character Counting	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Arrays Strings Arrays Strings	Ruby	Easy	2 mins	Solve
Check the following Ruby code: We want the following execution result: - Commit - PR - Merge What should we replace __BLOCK__ with to achieve this?
	Class and Self OOPs	Ruby	Medium	2 mins	Solve
What is the execution result of the following Ruby code?
	Exceptions Exceptions OOPs Syntax Exception Handling	Ruby	Easy	2 mins	Solve
What is the result of following Ruby code:
	New Class OOPs Singleton	Ruby	Medium	2 mins	Solve
Check the following Ruby code: Which all of the following statements should replace __BLOCK__ to have "Marvel" as execution result? A: Sample.new.class.ciao B: Sample.class.new.ciao C: Sample.new.ciao D: Sample.ciao
	Movie query problem Eager Loading N+1 Query Issue	Rails	Hard	4 mins	Solve
Our intern created the following model scope and they want to use in this view: Which of these code snippets they use to fetch the correct results, and avoid the N+1 query issue?
	Registration Queue Logic Queues Sorting By Custom Order	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic String Parsing Character Counting	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

Get started for free

Preview questions

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

It's very easy to share assessments with candidates and for candidates to use. We get good feedback from candidates about completing the tests. Adaface are very responsive and friendly to deal with.

Kirsty Wood, Human Resources, WillyWeather

We were able to close 106 positions in a record time of 45 days! Adaface enables us to conduct aptitude and psychometric assessments seamlessly. My hiring managers have never been happier with the quality of candidates shortlisted.

Amit Kataria, CHRO, Hanu

We evaluated several of their competitors and found Adaface to be the most compelling. Great library of questions that are designed to test for fit rather than memorization of algorithms.

Swayam Narain, CTO, Affable

Why you should use Pre-employment Ruby & Rails Online Test?

The Ruby & Rails Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Ruby Basics
Ruby OOPs
Rails Fundamentals
Rails MVC
REST APIs in Rails
Ruby Coding
Handling exceptions and errors in Ruby
Understanding object-oriented principles in Ruby
Building web applications with Rails
Implementing MVC architecture in Rails

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the Ruby & Rails Online Test?

Ruby Basics: This skill covers the fundamental concepts of the Ruby programming language, including syntax, data types, variables, and control flow. It is important to measure this skill in the test to assess the candidate's understanding of the core concepts of Ruby, which is essential for writing efficient and maintainable code.

Ruby OOPs: This skill focuses on object-oriented programming concepts in Ruby, such as classes, objects, inheritance, and polymorphism. It is necessary to measure this skill to evaluate the candidate's ability to design and implement scalable and reusable code using the principles of object-oriented programming, which is crucial in building complex applications.

Rails Fundamentals: This skill encompasses the foundational aspects of the Ruby on Rails framework, including the Model-View-Controller (MVC) architecture, routing, active record, and database integration. Measuring this skill allows recruiters to assess the candidate's proficiency in understanding how Rails framework works and their ability to build web applications following best practices.

Rails MVC: This skill focuses specifically on the Model-View-Controller (MVC) pattern within the Ruby on Rails framework. It is important to measure this skill to evaluate the candidate's understanding of how to effectively structure and organize code in a Rails application, separating concerns and promoting code reusability and maintainability.

REST APIs in Rails: This skill covers the implementation of RESTful APIs using Ruby on Rails. Measuring this skill is crucial as REST APIs are the backbone of modern web development, and assessing the candidate's expertise in building, designing, and testing APIs helps ensure they can handle the complexities involved in developing robust web services.

Ruby Coding: This skill evaluates the candidate's proficiency in writing clean, efficient, and idiomatic Ruby code. It is necessary to measure this skill to assess the candidate's coding style, problem-solving abilities, and familiarity with common Ruby idioms, which are essential qualities for a competent Ruby developer.

Full list of covered topics

The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for Ruby & Rails Test to be based on.

Variables

Data Types

Operators

Conditional Statements

Loops

Functions

Classes

Inheritance

Polymorphism

Encapsulation

ActiveRecord

Routing

Controllers

Views

Model-View-Controller

RESTful Routes

Serializers

Authentication

Authorization

Testing

Associations

Helpers

Callbacks

Migrations

Validations

Error Handling

API Versioning

Caching

Background Jobs

Pagination

Deployment

Action Mailer

Action Cable

Gemfile

RSpec

FactoryBot

JavaScript Integration

CSS Integration

JSON Serialization

Database Queries

Asset Pipeline

ActiveJob

WebSockets

ActionView

ActionController

ActionDispatch

Gem Development

Localization

Plugin Development

Performance Optimization

Task Automation

Continuous Integration

Git Integration

Code Refactoring

Debugging

Command Line Usage

Regular Expressions

SQL Queries

What roles can I use the Ruby & Rails Online Test for?

Ruby Developer
Rails Developer
Backend Developer
Full Stack Developer

How is the Ruby & Rails Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Developing RESTful APIs in Rails
Using appropriate data structures and algorithms in Ruby
Testing and debugging Ruby code
Understanding database interactions in Rails
Implementing user authentication and authorization in Rails
Optimizing performance of Ruby and Rails applications
Working with third-party libraries and gems in Ruby
Implementing caching mechanisms in Rails
Deploying Ruby and Rails applications
Troubleshooting and resolving production issues in Ruby and Rails

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

Preview this test

View sample scorecard

Try the most advanced candidate assessment platform

ChatGPT Protection

Non-googleable Questions

Web Proctoring

IP Proctoring

Webcam Proctoring

MCQ Questions

Coding Questions

Typing Questions

Personality Questions

Custom Questions

Ready-to-use Tests

Custom Tests

Custom Branding

Bulk Invites

Public Links

ATS Integrations

Multiple Question Sets

Custom API integrations

Role-based Access

Priority Support

GDPR Compliance

Screen candidates in 3 easy steps

Pick a test from over 500+ tests

The Adaface test library features 500+ tests to enable you to test candidates on all popular skills- everything from programming languages, software frameworks, devops, logical reasoning, abstract reasoning, critical thinking, fluid intelligence, content marketing, talent acquisition, customer service, accounting, product management, sales and more.

Invite your candidates with 2-clicks

Make informed hiring decisions

Get started for free

Preview questions

Have questions about the Ruby & Rails Hiring Test?

What is Ruby & Rails Test?

The Ruby & Rails Test is designed to assess a candidate's proficiency in Ruby programming and Ruby on Rails framework. It is used by recruiters to evaluate the technical skills of developers.

Can I combine Ruby & Rails Test with SQL questions?

Yes, you can request a custom test that includes both Ruby, Rails, and SQL questions. Check the Ruby, Rails & SQL Test for more details.

What topics are evaluated in the Ruby & Rails Test?

This test evaluates Ruby Basics, Ruby OOPs, Rails Fundamentals, Rails MVC, REST APIs in Rails, and Ruby Coding. For senior roles, it also covers advanced topics like performance optimization and user authentication.

How to use Ruby & Rails Test in my hiring process?

Use the Ruby & Rails Test as a pre-screening tool early in your recruitment process. Include a link to the assessment in your job post or send invitations directly via email.

What are the main coding tests?

Some of the main coding tests include:

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

View sample scorecard

Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

View sample scorecard