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About the 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.

Covered skills:

  • Standard Rust Operators and Syntax
  • Generic Structs
  • Reference Counting
  • Ownership Concepts
  • OOPS concepts
  • Concurrency
  • Enums and Pattern Matching
  • Smart Pointers
  • Thread Pools and Worker
  • Loops and Strings
  • Generic Iterators
  • Threads

9 reasons why
9 reasons why

Adaface Rust Test is the most accurate way to shortlist Rust Developers



Reason #1

Tests for on-the-job skills

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
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

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 10,000+ 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
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

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

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment Rust Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the Rust Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring


Learn more

About the Rust Assessment Test

Why you should use Pre-employment Rust Online Test?

The Rust 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:

  • Understanding of Standard Rust Operators and Syntax
  • Knowledge of Enums and Pattern Matching in Rust
  • Ability to work with Generic Structs in Rust
  • Familiarity with Smart Pointers in Rust
  • Understanding of Reference Counting in Rust
  • Experience with Thread Pools and Workers in Rust
  • Mastery of Ownership Concepts in Rust
  • Proficiency in Loops and String Manipulation in Rust
  • Knowledge of Object-Oriented Programming Concepts in Rust
  • Ability to work with Generic Iterators in Rust

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 Rust Online Test?

  • 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.

  • 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 Rust Online Test to be based on.

    Standard Operators
    Syntax
    Enums
    Pattern Matching
    Generic Structs
    Smart Pointers
    Reference Counting
    Thread Pools
    Workers
    Ownership Concepts
    Loops
    Strings
    OOPS Concepts
    Generic Iterators
    Concurrency
    Threads

What roles can I use the Rust Online Test for?

  • Rust Developer
  • Rust Programmer
  • Rust on Rails Developer
  • Software Engineer - Rust on Rails
  • Rust Engineer

How is the Rust 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

  • Understanding of Concurrency in Rust
  • Proficiency in Threads and Thread Safety in Rust
  • Experience with Error Handling Mechanisms in Rust
  • Knowledge of Structs and Struct Methods in Rust
  • Ability to use Rust's File I/O and Networking Capabilities
  • Familiarity with Compilation and Build Systems in Rust
  • Proficiency in Asynchronous Programming in Rust
  • Understanding of Rust's Memory Model and Memory Management
  • Experience with Rust's Trait System and Trait Bounds
  • Knowledge of Performance Optimization Techniques in Rust

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

Singapore government logo

The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.


85%
reduction in screening time

Rust Hiring Test FAQs

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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40 min tests.
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