Linkedin Rust Programming Assessment Answers

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Linkedin Rust Programming Assessment Answers
Linkedin Rust Programming Assessment Answers

100% Free Updated Linkedin Rust Programming Assessment Certification Exam Questions & Answers.

Linkedin Rust Programming Assessment Details:

  • 15 – 20 multiple-choice questions
  • 1.5 minutes per question
  • Score in the top 30% to earn a badge

Before you start:

You must complete this assessment in one session — make sure your internet is reliable.
You can retake this assessment once if you don’t earn a badge.
LinkedIn won’t show your results to anyone without your permission.
After completing the exam, you will get the verified Linkedin Rust Programming Assessment Badge.

Linkedin Rust Programming Assessment Answers

Q1. Which type cast preserves the mathematical value in all cases?

  • [ ] i64 as i32
  • [ ] usize as u64
  • [x] i32 as i64
  • [ ] f64 as f32

Q2. What do the vertical bars represent here?

str::thread::spawn(|| {
  • [x] a closure
  • [ ] a thread
  • [ ] a future
  • [ ] a block


Q3. Which choice is not a scalar data type?

  • [ ] integer
  • [ ] float
  • [ ] boolean
  • [x] tuple

Q4. _ cannot be destructured.

  • [x] Traits
  • [ ] Tuples
  • [ ] Enums
  • [ ] Structs


Q5. Which cargo command checks a program for error without creating a binary executable?

  • [ ] cargo –version
  • [ ] cargo init
  • [ ] cargo build
  • [x] cargo check
Linkedin Rust Programming Assessment Answers

Q6. The term box and related phrases such as boxing a value are often used when relating to memory layout. What does box refer to?

  • [ ] It’s creating a pointer on the heap that points to a value on the stack.
  • [x] It’s creating a pointer on the stack that points to a value on the heap.
  • [ ] It’s creating a memory guard around values to prevent illegal access.
  • [ ] It’s an abstraction that refers to ownership. “Boxed” values are clearly labelled.

Q7. What is an alternative way of writing slice that produces the same result?

let s = String::form("hello");
let slice = &s[0..2];
  • [ ] let slice = &s[len + 2];
  • [ ] let slice = &s[len – 2];
  • [ ] let slice = &s.copy(0..2);
  • [x] let slice = &s[..2];

Q8. Using the ? operator at the end of an expression is equivalent to _.

  • [ ] a match pattern that branches into True or False
  • [ ] calling ok_error()
  • [ ] calling panic!()
  • [x] a match pattern that may result an early return

Q9. Which is valid syntax for defining an array of i32 values?

  • [ ] Array::with_capacity(10)
  • [ ] [i32]
  • [ ] Array::new(10)
  • [x] [i32; 10]

Q10. What syntax is required to take a mutable reference to T, when used within a function argument?

fn increment(i: T) {
    // body elided
  • [ ] *mut T
  • [ ] mut ref T
  • [ ] mut &T
  • [x] &mut T
Linkedin Rust Programming Assessment Answers

Q11. The smart pointers Rc and Arc provide reference counting. What is the API for incrementing a reference count?

  • [ ] .add()
  • [ ] .incr()
  • [x] .clone()
  • [ ] .increment()


Q12. What happens when an error occurs that is being handled by the question mark (?) operator?

  • [ ] The error is reported and execution continues.
  • [ ] An exception is raised. The effect(s) of the exception are defined by the error! macro.
  • [ ] The program panics immediately.
  • [x] Rust attempts to convert the error to the local function’s error type and return it as Result::Err. If that fails, the program panics.

Q13. Which comment syntax is not legal?

  • [ ] /*
  • [x] #
  • [ ] //!
  • [ ] //

Q14. In matching patterns, values are ignored with _.

  • [ ] .ignore()
  • [ ] an underscore (_)
  • [x] ..
  • [ ] skip

Q15. Defining a _ requires a lifetime parameter.

  • [ ] function that ends the lifetime of one of its arguments
  • [x] struct that contains a reference to a value
  • [ ] function with a generic argument
  • [ ] struct that contains a reference to a boxed value

Rust book reference

Linkedin Rust Programming Assessment Answers

Q16. Which example correctly uses std::collections::HashMap’s Entry API to populate counts?

use std::collections::HashMap;
fn main() {
    let mut counts = HashMap::new();
    let text = "LinkedIn Learning";
    for c in text.chars() {
        // Complete this block
    println!("{:?}", counts);
  • [ ]
for c in text.chars() {
    if let Some(count) = &mut counts.get(&c) {
        counts.insert(c, *count + 1);
    } else {
        counts.insert(c, 1);
  • [x]
for c in text.chars() {
    let count = counts.entry(c).or_insert(0);
    *count += 1;
  • [ ]
for c in text.chars() {
    let count = counts.entry(c);
    *count += 1;
  • [ ]
for c in text.chars() {
    counts.entry(c).or_insert(0).map(|x| x + 1);


Q17. Which fragment does not incur memory allocations while writing to a “file” (represented by a Vec)?

use std::collections::HashMap;
fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut v = Vec::<u8>::new();
    let a = "LinkedIn";
    let b = 123;
    let c = '';
    // replace this line
    println!("{:?}", v);
  • [x]
write!(&mut v, "{}{}{}", a, b, c)?;
  • [ ]
  • [ ]
v.write(a, b, c)?;
  • [ ]
c.encode_utf8(&mut v);
  1. Answered in rust user forum
  2. reference

Q18. Does the main function compile? If so, why? If not, what do you need to change?

fn main() {
    let Some(x) = some_option_value;
  • [ ] The code does not compile. let statements require a refutable pattern. Add if before let.
  • [ ] The code compiles. let statements sometimes require a refutable pattern.
  • [x] The code does not compile. let statements requires an irrefutable pattern. Add if before let.
  • [ ] The code compiles. let do not require a refutable pattern.

Q19. Which statement about lifetimes is false?

  • [ ] Lifetimes were redundantly specified in previous version of Rust.
  • [ ] Lifetimes are specified when a struct is holding a reference to a value.
  • [ ] Lifetimes are specified when certain values must outlive others.
  • [x] Lifetimes are always inferred by the compiler.

Q20. When used as a return type, which Rust type plays a similar role to Python’s None, JavaScript’s null, or the void type in C/C++?

  • [ ] !
  • [ ] None
  • [ ] Null
  • [x] ()

Q21. To convert a Result to an Option, which method should you use?

  • [ ] .as_option()
  • [x] .ok()
  • [ ] .to_option()
  • [ ] .into()

Q22. Which statement about the Clone and Copy traits is false?

  • [x] Copy is enabled for primitive, built-in types.
  • [ ] Without Copy, Rust applies move semantics to a type’s access.
  • [ ] When using Clone, copying data is explicit.
  • [ ] Until a type implements either Copy or Clone, its internal data cannot be copied.

ref from stack overflow

Q23. Why does this code not compile?

fn returns_closure() -> dyn Fn(i32) -> i32 {
    |x| x + 1
  • [ ] The returned fn pointer and value need to be represented by another trait.
  • [ ] Closures are types, so they cannot be returned directly from a function.
  • [ ] Closures are types and can be returned only if the concrete trait is implemented.
  • [x] Closures are represented by traits, so they cannot be a return type.

Rust book reference

Q24. What smart pointer is used to allow multiple ownership of a value in various threads?

  • [x] Arc<T>
  • [ ] Box<T>
  • [ ] Both Arc<T> and Rc<T> are multithread safe.
  • [ ] Rc<T>

Rust book reference

Q25. Which types are not allowed within an enum variant’s body?

  • [ ] zero-sized types
  • [ ] structs
  • [x] trait objects
  • [ ] floating-point numbers


Linkedin Rust Programming Assessment Answers

Q26. Which statement about this code is true?

fn main() {
    let c = 'z';
    let heart_eyed_cat = '';
  • [x] Both are character literals.
  • [ ] heart_eyed_cat is an invalid expression.
  • [ ] c is a string literal and heart_eyed_cat is a character literal.
  • [ ] Both are string literals.


Q27. Your application requires a single copy of some data type T to be held in memory that can be accessed by multiple threads. What is the thread-safe wrapper type?

  • [ ] Mutex<Arc<T>>
  • [ ] Rc<Mutex<T>>
  • [x] Arc<Mutex<T>>
  • [ ] Mutex<Rc<T>>

Rust book reference

Q28. Which idiom can be used to concatenate the strings abc?

let a = "a".to_string();
let b = "b".to_string();
let c = "c".to_string();
  • [ ] String::from(a,b,c)
  • [x] format!("{}{}{}", a, b, c)
  • [ ] concat(a,b,c)
  • [ ] a + b + c

Q29. In this function. what level of access is provided to the variable a?

use std::fmt::Debug;
fn report<T:Debug>(a: &T) {
    eprintln!("info: {:?}", a);
  • [ ] print
  • [x] read-only
  • [ ] read/write
  • [ ] debug

Q30. Which choice is not valid loop syntax?

  • [ ] loop
  • [ ] for
  • [ ] while
  • [x] do

Q31. How do you construct a value of Status that is initialized to Waiting?

enum Status {
  • [ ] let s = Enum::new(Status::Waiting);
  • [ ] let s = new Status::Waiting;
  • [x] let s = Status::Waiting;
  • [ ] let s = Status::new(Waiting);

Q32. Which statement about enums is false?

  • [ ] Enums are useful in matching patterns.
  • [ ] Option is an enum type.
  • [ ] Enum variants can have different types with associated data.
  • [x] the term enum is short for enummap

Q33. What does an underscore (_) indicate when used as pattern?

  • [x] It matches everything.
  • [ ] It matches underscores.
  • [ ] It matches any value that has a length of 1.
  • [ ] It matches nothing.

Q34. What is a safe operation on a std::cell:UnsafeCell<T>?

  • [ ] A &mut T reference is allowed. However it may not cpexists with any other references. and may be created only in single-threaded code.
  • [ ] UnsafeCell<T> provides thread-safety. Therefore, creating &T references from multiple threads is safe.
  • [x] The only safe operation is the .get() method, which returns only a raw pointer.
  • [ ] Non. UnsafeCell<T> only allows code that would otherwise need unsafe blocks to be written in safe code.


Q35. Generics are useful when you _.

  • [ ] need to reduce code duplication by concretizing values and restricting parameters in functions
  • [x] need to reduce code duplication by abstracting values further, such as in function parameters
  • [ ] need a supertrait
  • [ ] are not sure if you need a specific kind of trait

Linkedin Rust Programming Assessment Answers

Q36. _ cannot be destructed.

  • [x] Traits
  • [ ] Enums
  • [ ] Tuples
  • [ ] Structs

Q37. How do you create a Rust project on the command-line?

  • [x] cargo new
  • [ ] rustup init
  • [ ] cargo start
  • [ ] rust new-project

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What is Linkedin Assessment?

The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added to your profile by completing assessments specific to those skills. LinkedIn skills evaluations are a means to demonstrate the skills of job hunters. This is how LinkedIn Skill Assessments can be used.

Is this Skill Assessment Test is free?

Yes, Linkedin Rust Programming Assessment Answers is totally free on LinkedIn for you. The only thing is needed i.e. your dedication toward learning.

When I will get Skill Badge?

Yes, if will Pass the Skill Assessment Test, then you will earn a skill badge that will reflect in your LinkedIn profile. For passing in LinkedIn Skill Assessment, you must score 70% or higher, then only you will get your to skill badge.

How to participate in skill quiz assessment?

It’s good practice to update and tweak your LinkedIn profile every few months. After all, life is dynamic and (I hope) you’re always learning new skills. You will notice a button under the Skills & Endorsements tab within your LinkedIn Profile: ‘Take skill quiz.‘ Upon clicking, you will choose your desired skill test quiz and complete your assessment.

LinkedIn Skill Assessments are a series of multiple-choice exams that allow you to prove the skills that are stated in your profile.

How to get Linkedin Skill Badge?

For getting Linkedin Badge in your profile, you need to score at least 70% and above for getting recognition of skill badges.

If you “grade in the 70th percentile or above”—according to LinkedIn—you officially pass and get a LinkedIn skill badge. The social media site will display your badge on your profile.

How long is Skill Assessment valid for?

Skills assessments that do not specify an expiry date are valid for 3 years from the date of the assessment. If more than 3 years have passed by the time the visa application is made, the skills assessment will no longer be valid.

What is the Benefit of Linkedin Skill Assessment?

  • Chances of getting hired will be increased.
  • You will earn Linkedin Skill Badge.
  • Your Linkedin Profile will rank on top.
  • You have a chance to get jobs earlier.
  • This Skill Assessment will enhance your technical skills, helps you to get recognized by top recruiters, and advanced your knowledge by testing your mind.

Who can give this Linkedin Skill Assessment Test?

Any Linkedin User, Any engineer, developer, or programmer, who wants to improve their Programming Skills
Anyone interested in improving their whiteboard coding skills
Anyone who wants to become a Software Engineer, SDE, Data Scientist, Machine Learning Engineer, etc.
Any students in college who want to start a career in Data Science
Students who have at least high school knowledge in math and who want to start learning data structures
Any self-taught programmer who missed out on a computer science degree.

How to do LinkedIn skill assessment

The LinkedIn Skill Assessments feature allows you to demonstrate your knowledge of the skills you’ve added on your profile by completing assessments specific to those skills.

A typical assessment consists of 15 multiple choice questions and each question tests at least one concept or subskill. The questions are timed and must be completed in one session. You can view the full list of available Skill Assessments and sample questions for each.

Available Skill Assessments on LinkedIn

.NET FrameworkAgile Methodologies, Amazon Web Services (AWS), Android, AngularJS, Angular, AutoCAD, AWS, Bash, C, C#, C++, CSS, GIT, Hadoop, HTML, Java, JavaScript, jQuery, JSON, Maven, and MS Vision, QuickBooks, Revit, etc.

What You Need to Know About LinkedIn Skill Assessments

During a job search, wouldn’t it be great to have a way to prove your proficiency in a specific skill to hiring managers?

Well, now there is. On September 17, LinkedIn launched its new Skill Assessments feature. These are online assessments you can take to demonstrate your proficiency in an area such as MS Excel or jQuery. All assessments have been designed by subject matter and LinkedIn Learning experts, and they’re based on an in-depth content creation and review process. Moreover, these assessments seem to be well received: Research shows that job seekers who’ve completed LinkedIn Skill Assessments are approximately 30 percent more likely to get hired than those who haven’t.

How LinkedIn Skill Assessments work
To take an assessment, all you have to do is navigate to the skills section of your profile and select the relevant Skill Assessment. Note that the test is timed. If you have a disability, you can activate the accessibility for the Skill Assessment feature. This will allow you additional time to complete each question.

Your score is private by default, meaning that you can control the visibility of the results. If you score in the 70th percentile or higher, you’ll pass the assessment and have the option of displaying a “verified skill” badge on your profile. If you don’t pass, you can take the assessment again once you’ve brushed up your skills. However, keep in mind that you can only take each assessment once per three months

When you’ve completed an assessment, LinkedIn provides you with an outline of your results. In addition, for a limited time, it offers relevant LinkedIn Learning courses for free so you can improve further. You’ll also receive relevant job recommendations.

According to Andrew Martins in his Business News Daily article “LinkedIn Users Can Now Showcase Skill Assessments,” the following assessments are currently available:

Adobe Acrobat, Angular, AWS, Bash, C, C#, C++, CSS, GIT, Hadoop, HTML, Java, Javascript, jQuery, JSON, Maven, MongoDB, MS Excel, MS PowerPoint, MS Project, MS SharePoint, MS Visio, Node.js, Objective-C, PHP, Python, QuickBooks, Ruby, Ruby on Rails, Scala, Swift, WordPress, and XML. Experts believe that there are also more, non-technical assessments in the making.

A good way to showcase your skills
LinkedIn Skill Assessments offer a brilliant way for you to showcase your abilities to potential employers while at the same time giving you the opportunity to hone your skills even further. So, take advantage of what’s offered — and use it to maximize your employability!


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