Scala Online Test

The Scala Online test uses scenario-based MCQs to evaluate candidates on their knowledge and proficiency in working with Scala programming language, including core concepts, syntax, and functional programming principles. The test assesses a candidate's ability to design and develop efficient and scalable applications using Scala. The test includes a coding question to evaluate hands-on Scala programming skills.

Covered skills:

Scala programming language
Functional programming
Object-oriented programming
Collections
Pattern matching
Concurrency and parallelism
Error handling
Type inference
Traits and mixins
Higher-order functions
Immutable data structures
Scala test frameworks

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About the Scala Test

The Scala 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 Scala programming language
Strong understanding of functional programming
Expertise in object-oriented programming
Knowledge of collections in Scala
Ability to effectively use pattern matching
Experience in concurrency and parallelism in Scala
Skilled in error handling
Familiarity with type inference in Scala
Able to utilize traits and mixins in Scala
Proficient in higher-order functions
Understanding of immutable data structures in Scala
Familiarity with Scala test frameworks

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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 Scala Online Test will be non-googleable.

🧐 Question
Medium placeholder method	Solve
Review the following Scala code. “placeholder” is a placeholder function to be replaced with an actual Scala in-built method. What should ‘placeholder’ be so that the a, b, c in the code evaluate to true?
Medium Compilation Errors Compilation Errors Scala Syntax	Solve
Which lines in the following Scala code will lead to compilation errors?
Easy take and reduceLeft List String	Solve
What will the following Scala code print?
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
	Medium placeholder method	2 mins Scala	Solve
Review the following Scala code. “placeholder” is a placeholder function to be replaced with an actual Scala in-built method. What should ‘placeholder’ be so that the a, b, c in the code evaluate to true?
	Medium Compilation Errors Compilation Errors Scala Syntax	2 mins Scala	Solve
Which lines in the following Scala code will lead to compilation errors?
	Easy take and reduceLeft List String	2 mins Scala	Solve
What will the following Scala code print?
	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
	placeholder method	Scala	Medium	2 mins	Solve
Review the following Scala code. “placeholder” is a placeholder function to be replaced with an actual Scala in-built method. What should ‘placeholder’ be so that the a, b, c in the code evaluate to true?
	Compilation Errors Compilation Errors Scala Syntax	Scala	Medium	2 mins	Solve
Which lines in the following Scala code will lead to compilation errors?
	take and reduceLeft List String	Scala	Easy	2 mins	Solve
What will the following Scala code print?
	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.

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Why you should use Pre-employment Scala Online Test?

The Scala Online 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:

Ability to write clean and efficient Scala code
Proficiency in functional programming concepts like immutability, higher-order functions, and pattern matching
Strong understanding of object-oriented programming principles and their application in Scala
Expertise in working with Scala collections and their associated methods
Experience in error handling and writing robust code
Knowledge of concurrency and parallelism in Scala
Familiarity with type inference and type checking in Scala
Understanding of traits and mixins in Scala
Ability to work with and test Scala code using appropriate frameworks
Understanding of immutable data structures and their advantages in Scala

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 Scala Online Test?

Scala programming language: Scala is a modern, multi-paradigm programming language that combines the best features of object-oriented and functional programming. It provides a concise syntax, powerful pattern matching capabilities, and seamless integration with Java. Measuring this skill ensures that candidates have a strong understanding of Scala's fundamentals and can effectively utilize its features in real-world projects.

Functional programming: Functional programming is a programming paradigm that focuses on immutability, pure functions, and higher-order functions. It allows developers to write concise, modular, and maintainable code by avoiding shared state and side effects. Assessing a candidate's proficiency in functional programming is crucial to ensure they can leverage Scala's functional capabilities to write efficient and robust code.

Object-oriented programming: Object-oriented programming is a programming paradigm centered around objects that contain data and behavior. It promotes encapsulation, inheritance, and polymorphism to enable modular and reusable code. Evaluating a candidate's understanding of object-oriented principles in Scala is essential as it enables them to design and implement scalable and extensible solutions.

Collections: Collections are fundamental data structures in Scala that provide a wide range of operations for manipulating and processing sequences of elements. Proficiency in working with collections is vital to write efficient and expressive code. Evaluating a candidate's knowledge of Scala collections ensures they can leverage these powerful constructs effectively in their programs.

Pattern matching: Pattern matching is a powerful feature in Scala that allows developers to match complex data structures and extract values based on predefined patterns. It simplifies code and enables elegant solutions to various problems. Assessing a candidate's ability to use pattern matching effectively ensures they can write concise and readable code.

Concurrency and parallelism: Concurrency and parallelism are important concepts in modern software development to leverage the power of multi-core processors and increase the performance of applications. Evaluating a candidate's understanding of concurrency and parallelism in Scala ensures they can design and implement concurrent and efficient solutions that make efficient use of system resources.

Error handling: Error handling is a critical aspect of writing robust and maintainable software. Scala provides various mechanisms to handle exceptions and errors, such as try/catch blocks and the Option and Either types. Evaluating a candidate's knowledge of error handling in Scala ensures they can effectively handle and communicate errors in their code.

Type inference: Type inference is a feature in Scala that allows the compiler to automatically deduce the types of expressions and variables. It reduces the verbosity of code and promotes more concise and readable programs. Measuring a candidate's understanding of type inference ensures they can take advantage of this feature to write clean and expressive code.

Traits and mixins: Traits and mixins are powerful mechanisms in Scala that allow code reuse and composition. Traits enable the creation of reusable units of behavior, while mixins provide a way to combine multiple traits into a single class. Assessing a candidate's knowledge of traits and mixins ensures they can design and implement modular and reusable components in Scala.

Higher-order functions: Higher-order functions are functions that take one or more functions as arguments or return functions as results. They promote code modularity and enable the creation of more expressive and reusable code. Evaluating a candidate's proficiency in higher-order functions ensures they can effectively leverage this powerful functional programming concept in their Scala programs.

Immutable data structures: Immutable data structures are data structures whose state cannot be modified after creation. They simplify code by eliminating complex mutation and shared state issues. Assessing a candidate's understanding of immutable data structures in Scala ensures they can write code that is easier to reason about, test, and maintain.

Scala test frameworks: Scala test frameworks are libraries that provide a set of tools and utilities to write and execute tests for Scala applications. They enable developers to create comprehensive test suites and automate the validation of their code. Evaluating a candidate's familiarity with Scala test frameworks ensures they can write reliable and robust tests to ensure the correctness of their Scala code.

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 Scala Online Test to be based on.

Basic syntax

Functions

Data types

Variables

Classes

Objects

Inheritance

Polymorphism

Encapsulation

Higher-order functions

Pattern matching

Collections

Immutable data structures

Error handling

Concurrency

Parallelism

Generics

Type inference

Traits

Mixins

Higher-order types

Partial functions

For-comprehensions

Implicits

Value classes

Case classes

Lazy evaluation

Basic IO operations

Handling XML and JSON

Concurrency tools (Futures, Promises, etc.)

Testing with Scala test frameworks

Distributed programming with Akka

Functional libraries (e.g. Cats, Scalaz)

Type classes

Parallel collections

Functional error handling

Stream processing

Parallel programming with Scala

Big Data processing with Scala

Reactive programming in Scala

Database access with Scala

Scala and Java interop

Concurrency patterns

Type-level programming

Closures

Immutable collections

Understanding the Scala compiler

Reading and writing files

Regular expressions

Type-safe configuration management

Working with futures

Asynchronous programming

Software design principles

Functional testing

Debugging techniques

What roles can I use the Scala Online Test for?

Scala Developer
Big Data Developer
Senior Scala Software Engineer
Senior Big Data Engineer - Scala

How is the Scala 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

Ability to apply Scala libraries and frameworks effectively
Proficiency in using Scala's built-in test frameworks for unit testing
Experience in optimizing Scala code for performance
Knowledge of advanced Scala language features
Strong problem-solving skills using Scala
Ability to debug and troubleshoot Scala code efficiently
Capability to write concise and readable Scala code
Understanding of Scala's interoperability with Java
Experience in writing concurrent and parallel Scala code
Proficiency in using functional programming libraries and frameworks in Scala

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

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Have questions about the Scala Hiring Test?

What is Scala Online Test?

The Scala Online Test is designed to assess candidates' proficiency in the Scala programming language. Recruiters use it to evaluate applicants for positions requiring Scala expertise, making it helpful in identifying the most skilled Scala developers.

Can I combine Scala Online Test with Java questions?

Yes, recruiters can request a single custom test combining Scala and Java questions. For more details on how we assess Java skills, check out our Java Online Test.

What topics are evaluated in the Scala Online Test?

The test covers a wide range of topics, including Scala programming language, functional programming, object-oriented programming, collections, pattern matching, concurrency and parallelism, error handling, type inference, traits and mixins, higher-order functions, immutable data structures, and Scala test frameworks.

How to use Scala Online Test in my hiring process?

Use the Scala Online Test as a pre-screening tool. Add the test link to your job post or invite candidates by email. This helps identify skilled candidates early in the recruitment process.

What are the main programming language tests?

We offer a variety of programming language tests. Some of them are:

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.

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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.

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