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Rust Online Test

The Rust Online test uses scenario-based MCQs to evaluate candidates on their knowledge of Rust programming language, including syntax, data types, memory management, and concurrency. The test aims to evaluate a candidate's ability to write safe and efficient Rust code that meets specific requirements. The test includes a coding question to evaluate hands-on Rust programming skills.

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Screen candidates with a 35 mins test

Test duration:  35 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 6 Rust MCQs
  • 1 Rust Coding Question
Covered skills:
Standard Rust Operators and Syntax
Enums and Pattern Matching
Generic Structs
Smart Pointers
Reference Counting
Thread Pools and Worker
Ownership Concepts
Loops and Strings
OOPS concepts
Generic Iterators
Concurrency
Threads
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Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Use the Rust Test to shortlist qualified candidates

The Rust 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:

  • Ability to write correct and efficient Rust code using standard operators and syntax
  • Ability to work with enums and pattern matching in Rust
  • Ability to understand and utilize generic structs in Rust
  • Ability to work with smart pointers in Rust
  • Ability to comprehend and implement reference counting in Rust
  • Ability to use thread pools and workers in Rust
  • Understanding of ownership concepts in Rust
  • Ability to work with loops and strings in Rust
  • Understanding of OOPS concepts in Rust
  • Ability to work with generic iterators in Rust
  • Understanding of concurrency concepts in Rust
  • Ability to work with threads in Rust
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Screen candidates with the highest quality 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 Rust Online Test will be non-googleable.

🧐 Question

Easy

Join Handles
Concurrency
Solve
Review the following two Rust code snippets:
 image
Notice the handle.join().unwrap() line added in snippet two. Pick the correct statements:

A: Snippet one prints 1 to 5 in the spawned thread and 1 to 3 in the main thread always.
B: Snippet one prints 1 to 3 in the main thread but spawned thread might be closed before it prints all the numbers.
C: Snippet two prints 1 to 5 in the spawned thread and 1 to 3 in the main thread always. 
D: Snippet two prints 1 to 3 in the main thread but the spawned thread might be closed before it prints all the numbers.

Medium

Mutable Sample
Structs
Variables and Mutability
Solve
What does the following Rust code print?
 image

Medium

Passed Function
Closures
Solve
Review the following code and pick the correct statements:
 image
A: The code prints 1223
B: The code prints 1111
C: The code prints 1234
D: The callPassedFunction(passedFunction) on line 7 makes a copy of passedFunction to become the argument of callPassedFunction. The copy gets executed and the x of copy becomes 2, but the original closure still holds a value of 1 for its captured x.
E: The callPassedFunction(passedFunction) on line 7 makes a copy of passedFunction to become the argument of callPassedFunction. The copy gets executed and x of the copy and the origin both become 2.

Easy

Registration Queue
Logic
Queues
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
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

Join Handles
Concurrency

2 mins

Rust
Solve

Medium

Mutable Sample
Structs
Variables and Mutability

2 mins

Rust
Solve

Medium

Passed Function
Closures

2 mins

Rust
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Join Handles
Concurrency
Rust
Easy2 mins
Solve
Mutable Sample
Structs
Variables and Mutability
Rust
Medium2 mins
Solve
Passed Function
Closures
Rust
Medium2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve

Test candidates on core Rust Hiring Test topics

Standard Rust Operators and Syntax: This skill covers understanding and implementing standard operators and syntax in the Rust programming language. It is important to measure this skill as it forms the foundation of any Rust program, allowing developers to perform operations on variables, control flow, and manipulate data effectively.

Enums and Pattern Matching: Enums and pattern matching in Rust are powerful tools for managing complex data types and making decisions based on different cases. This skill should be measured to assess a candidate's ability to work with and manipulate data structures in Rust using enum types and pattern matching constructs.

Generic Structs: Generic structs allow developers to create reusable data structures that can work with different types. Measuring this skill helps assess a candidate's understanding of generic programming concepts in Rust and their ability to write flexible and efficient code using generic structs.

Smart Pointers: Smart pointers are data structures in Rust that provide additional functionality and safety guarantees compared to regular pointers. This skill should be measured to evaluate a candidate's proficiency in managing memory, avoiding memory leaks, and utilizing advanced memory management features with smart pointers.

Reference Counting: Reference counting in Rust involves managing the ownership and lifetime of shared data through reference counts. Assessing this skill helps determine a candidate's understanding of memory management in Rust and their ability to handle shared resource ownership with reference counting.

Thread Pools and Worker: Thread pools and workers are essential for concurrency and parallelism in Rust. Measuring this skill is important for evaluating a candidate's knowledge of Rust's concurrency mechanisms, their ability to leverage thread pools for efficient execution, and their understanding of creating worker threads for distributing workloads.

Ownership Concepts: Ownership is a fundamental concept in Rust that determines how memory is allocated, accessed, and cleaned up. Evaluating this skill helps assess a candidate's grasp of unique ownership, borrowing, and lifetimes in Rust, enabling them to write safe and efficient code.

Loops and Strings: Loops and strings are basic constructs used in almost every programming language, and Rust is no exception. Measuring this skill allows recruiters to assess a candidate's familiarity with loop structures and their ability to manipulate and process string data in Rust.

OOPS concepts: OOPS (Object-Oriented Programming Systems) concepts are relevant in many programming languages, including Rust. Assessing this skill helps recruiters determine a candidate's understanding of encapsulation, inheritance, polymorphism, and other OOP principles, and their ability to apply these concepts in Rust development.

Generic Iterators: Generic iterators are essential in Rust for performing various operations on collections of data. This skill should be measured to evaluate a candidate's proficiency in using and manipulating iterators in Rust, which aids in writing concise, expressive, and efficient code.

Concurrency: Concurrency is the ability of a program to execute multiple tasks simultaneously. Measuring this skill helps determine a candidate's understanding of Rust's concurrency mechanisms, such as threads, channels, and locks, and their ability to write concurrent code that is both correct and efficient.

Threads: Threads in Rust enable the execution of multiple independent tasks concurrently. Assessing this skill allows recruiters to evaluate a candidate's knowledge of thread-related concepts, their ability to create and manage threads in Rust, and their expertise in writing safe and efficient concurrent programs.

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Have questions about the Rust Hiring Test?

What roles can I use the Rust Test for?

Here are few roles for which we recommend this test:

  • Rust Developer
  • Rust Programmer
  • Rust on Rails Developer
  • Software Engineer - Rust on Rails
  • Rust Engineer
Can I combine Rust Online Test with C++ questions?

Yes, recruiters can request a custom test combining Rust and C++ questions. For more details, check out the C++ Online Test.

How to use the Rust Online Test in my hiring process?

Use the test as a pre-screening tool at the start of your recruitment. Add the link to the test in your job post or invite candidates via email. This helps in identifying skilled candidates early.

What are the main Programming Language tests?

Some important programming language tests include:

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.

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.

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.

Can I get a free trial?

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

What is the Rust Online Test?

The Rust Online Test is an assessment designed to evaluate a candidate's proficiency in Rust programming. It is commonly used by recruiters and hiring managers to screen candidates for roles requiring Rust skills.

What skills are evaluated in the Rust Online Test?

The test covers:

  • Standard Rust Operators and Syntax
  • Enums and Pattern Matching
  • Generic Structs
  • Smart Pointers
  • Reference Counting
  • Thread Pools and Worker
  • Ownership Concepts
  • Loops and Strings
  • OOPS concepts
  • Generic Iterators
  • Concurrency
  • Threads
Can I test JavaScript and Node.js together in a test?

Yes, you can test JavaScript and Node.js together. It is recommended to provide a comprehensive assessment of both skills. Check out the JavaScript & NodeJS Test.

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.

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.

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.

What is the cost of using this test?

You can check out our pricing plans.

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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