Rust Interview Questions

Rust Interview Questions


This comprehensive guide has three sets of important Rust questions and answers: Beginners, Intermediate and Advanced.

Read, learn, practice and prepare yourself with these sure-shot golang interview questions to crack your next interview for a Rust developer job.

Introduction - Rust Interview Questions and Answers

We have compiled the top Rust interview questions and answers for you to prepare for your next interview. We have divided the questions into three categories based on experience.

  • Rust Interview Questions for Beginners
  • Intermediate Rust Interview Questions.
  • Advanced Rust Interview Questions.

  • We have selected the most asked Rust questions in any interview. Each of these questions represents some core insights on the Rust programming language.

    But first let’s discuss – Why is Rust one of the top programming languages? Why is there high demand for Rust developers? What makes Rust development a competitive job?. According to a Statista survey, Rust was the most desired language in 2022, with over 17% of respondents that are not developing with it, but expressed interest in developing with it. Python ranked second, followed by TypeScript.

    In the past several years, Rust has grown in popularity as one of the most widely used programming languages for web development. But why is it so popular among programmers? For starters, Rust is open-source, memory-safe, and beginner-friendly. Its syntax is comparable to that of C and C++. These factors have caused it to overtake C++ as the language’s main rival in recent years. Anyone who works on operating system contexts and does web development will find it to be very useful.

    The market share of the Rust programming language is 1.29%, and the average yearly wage for Rust programmers is $132,298. (PYPL, Zip Recruiter). The above statements prove that Rust is indeed one of the most sought-after programming languages. Now, let’s learn top interview questions on Rust. Let’s start.

    Rust Interview Questions for Beginners

    1. What is Cargo in Rust?

    It’s a package manager and build system for Rust users to manage projects in it. The Cargo system manages three things for users, building code, downloading the libraries, and rebuilding those libraries.

    2. Explain the significance of unwrap() everywhere function in Rust?

    This function is used to handle errors that extract the volume inside an option. It’s also extremely useful for instant prototypes with any errors.

    3. What are the Error Handling procedures in Rust?

    Rust Error Handling is categorized into three parts:

  • Recoverable Error with Results : If an error occurs, the program doesn’t stop completely. Instead, it can easily be interpreted or responded.
  • Unrecoverable Errors with Panic : If something wrong goes with the code, Rust’s panic macro comes into action, shows the error message, clean the error and then quit.
  • Panic or Not to Panic : When you are dicey about calling panic or not, write the code that panics and the process will continue as 2nd.
  • 4. How to declare global variables in Rust?

    For compile-time computed global constants, you can use the const keyword in Rust. Compile-time constants are currently limited in Rust; however, primitives can be defined via const declarations.

    5. How is Rust’s Garbage Collection done?

    Rust uses a static garbage collector. It works on the principle of automatic memory management which means it automatically recycles the memory that will not be used again.

    6. Does Rust guarantee tail-call optimization?

    No, Rust doesn’t guarantee TOC (Tail Call Optimization). Not even the standard library is required to compile the rust code. In these cases, the run time is similar to that of the C programming language.

    7. What’s Cargo.lock in Rust?

    When a user runs cargo build command it automatically creates a file named Cargo.lock to keep track of dependencies in the user application.

    8. Is it possible to write a complete operating system in Rust?

    Yes, it’s possible to write a complete operating system in Rust. Even a few of the latest released operating systems in recent days have used Rust as their primary programming language.

    Intermediate Rust Interview Questions

    As a Rust developer, with experience you will be able to answer Rust interview questions for freshers with much ease. In this section we have collected some Rust tricky interview questions for you. This section will help you with the exact kind of Intermediate Rust Interview Questions that you may face in your job hunt.

    1. What Are The Rules For Using Self, & Self, Or & Mut Self In A Method Declaration?

    – The “self” is use, while a function wishes to devour the price.
    – The “& self” is use, while a function handiest desires a examine-best connection with the fee.
    – The “& mut self” is use, when a feature needs to mutate the fee without eating it.

    2. What is Macro in Rust?

    A robust macro system that supports meta-programming is offered by Rust. Macros, which resemble functions with the exception of the fact that their names finish in a bang(! ), as you saw in the previous example, are extended into source code that is built alongside the rest of the programme rather than a function call. In contrast to functions, they offer a programme extra runtime features. Functions are developed into macros.

    3. What Is The Relationship Between A Module And A Crate?

    Module – A module is a unit of code organization inside a crate.

    Crate – A Crate is a compilation unit and it contains an implicit and un-named top-level module.

    4. What are the programming paradigms supported by Rust?

    The programming paradigms supported by Rust are

  • Concurrent computing
  • Functional programming
  • Generic programming
  • Structured programming
  • 5. Does Rust have function overloading?

    Any type of overloaded function/method is not supported by Rust. In a single argument as a workaround, to receive multiple values we can use tuples. For the admissible type of that single argument, we can then define a trait and implement it and to the implementation of the trait, the function will simply delegate.

    Advanced Rust Interview Questions

    This section contains some advanced interview questions on Rust. This section also explores a few Rust coding Interview questions. You may practice the common python programs which the interviewer often asks.

    1. Write a Rust program to print the Fibonacci series using recursion?

    Rust Interview Questions - Optymize

    2. Write a Rust Program to find factorials of a given number.

    Rust Interview Question | Optymize

    3. Write a Rust program to demonstrate If and Else statements.

    Rust Developers Interview Question

    4. Write a Rust program to create a user-defined function to add two integer numbers

    Rust Developer Interview Question

    5. Write Rust program to create an array without specifying the type.

    Rust Developer Interview - Optymize


    We hope these Rust interview questions and answers will be of great assistance to you throughout the process, whether you’re a developer getting ready for an interview or a hiring manager looking for the best applicant.

    Remember that the hiring process involves more than just technical expertise. To ensure that you land a high paying Rust developer job, both previous experience and soft skills are crucial.

    A lot of the Rust interview questions are open-ended, so keep that in mind. Interviewers are interested in your reasoning, not just the answer you memorised. Always be ready for follow-up questions regarding how you arrived at your answer. Describe your thought process.

    Have a cracking full-stack interview! You can go through our Full Stack Developer Jobs here.

    Good luck with your upcoming Rust interview! You can go through our Rust developers jobs here.