Skip to main content

Rust Programming Interview Questions and Answers

What Is Rust Programming?
Rust is a very new language. Rust is a systems programming language focused on safety, speed and concurrency.

Rust is a unique language, introducing new concepts. If you want to try Rust programming, install it and otherwise you can go online tutorials.

Install RustTo install Rust, download and run - rustup-init.exe

Rust Installation Steps -
          1)  Toolchain management with rust-up
          2) Configuring the Path environment variable
    3) Windows considerations

Rust is multi paradigm and most of the things can do just like OOPs in Rust but not everything. So, Rust is not pure object-oriented.

How fast is Rust?
It is very fast! Rust is already competitive with idiomatic C and C++.

Is Rust Garbage Collected?
No! One of Rust’s key innovations is guaranteeing memory safety without requiring garbage collection.

How do I get command line arguments in Rust?
The easiest way is to use Args that provides an iterator over the input arguments.

Is Rust object oriented?
It is multi paradigm and most of the things can do in Rust but not everything. So, Rust is not object-oriented.

Does Rust have copy constructors?

Does Rust have move constructors?
No! The values of all types are moved via memcpy.

What Are the Advantages?
ü  Predictable clean-up of resources
ü  Lower overhead for memory management
ü  Essentially no runtime system
ü  Rust avoids the need for GC through
ü  Thread-safe

What Are the Disadvantages?
ü  Rust compilation seems slow
ü  Rust has a moderately-complex type system
ü  The Rust compiler does not compile with optimizations unless asked to, as optimizations slow down compilation and are usually undesirable during development.
ü  Rust use of LLVM for code generation

Does Rust do tail-call optimization?
No! Not generally. It may be done in limited circumstances but is not guaranteed.

Does Rust have a Run-time?
Not! Rust code can be compiled without the standard library; In that case the runtime is roughly equivalent to C programming.

What string type should you use?
The string types -
ü  Slice type
o   str - UTF-8
o   OsStr - OS-compatible
o   CStr - C-compatible
ü  Owned type
o   String - UTF-8
o   OsString - OS-compatible
o   CString - C-compatible
What Are the Differences between the two different string types?
The “String” is an owned buffer of UTF-8 bytes allocated on the heap.
The “Strings” is Mutable and it can be modified.
The “&str” is a primitive type and it is implemented by the Rust language while String is implemented in the standard library.

How do I read a file into a String?
By using the read_to_string() method, which is defined on the Read trait in std::io.

What Are the rules for using self, &self, or &mut self in a method declaration?
The “self” is use, when a function needs to consume the value.
The “&self” is use, when a function only needs a read-only reference to the value.
The “&mut self” is use, when a function needs to mutate the value without consuming it.

What Is a deref coercion and How does it work?
A deref coercion is a handy coercion that automatically converts references to pointers into references to their contents.

The most common sorts of deref coercions -
ü  &String to &str
ü  &Arc<T> to &T
ü  &Vec<T> to &[T]
ü  &Rc<T> to &TW
ü  &Box<T> to &T

How do I read file input efficiently?
The File type implements the Read trait, which has a variety of functions for reading and writing data and its looks like-
ü  read()
ü  read_to_end()
ü  bytes()
ü  chars()
ü  take()

How do I do Asynchronous input/output in Rust?
There are several libraries providing asynchronous input/output in Rust i.e.
ü  mio
ü  tokio
ü  mioco
ü  coio-rs
ü  rotor
ü  And so on

What Is the deal with unwrap() everywhere?
The unwrap() function is use to handle errors that extracts the value inside an Option, if no value is present and It is also useful for quick prototypes where you don’t want to handle an error yet.

How do I debug Rust programs?
The Rust programs can be debugged using gdb or lldb as like C and C++ programming.

How do I do global variables in Rust?
In the Rust, you can globals declarations using const for compile time computed global constants.
Rust currently has limited support for compile time constants and we can define primitives using const declarations.

Can I write an operating system in Rust?
Yes! You can do.

Does Rust guarantee a specific data layout?
Not by default! Most of the general case, the enum and struct layouts are undefined.

What Is the idiomatic way to express platform-specific behavior in Rust?
Platform-specific behavior can be expressed using conditional compilation attributes as like -
ü  target_os
ü  target_family
ü  target_endian
ü  And so on

Can Rust be used for Android/iOS programming?
Yes! You can do.

How do I cross-compile in Rust?
It is possible but need a bit of work to set up.

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.

How do I do dynamic Rust library loading?
Use libloading for Import dynamic libraries in Rust, which provides a cross-platform system for dynamic linking.

How can I write a GUI application in Rust?
There are different ways to write GUI applications in Rust.
The List of -
ü  Cocoa
ü  GTK
ü  gyscos
ü  ImGui
ü  IUP and so on
How can I parse JSON/XML?
The serde is a library for serialization and deserialization of Rust. This is the recommended library.

How do I write an OpenGL app in Rust?
The glium is a library for OpenGL programming in Rust and GLFW is also a solid option.

Can Rust code call C code?
Yes! Calling C code from Rust is designed to be as efficient as calling C code from C++.
By Anil Singh | Rating of this article (*****)

Popular posts from this blog

39 Best Object Oriented JavaScript Interview Questions and Answers

Most Popular 37 Key Questions for JavaScript Interviews. What is Object in JavaScript? What is the Prototype object in JavaScript and how it is used? What is "this"? What is its value? Explain why "self" is needed instead of "this". What is a Closure and why are they so useful to us? Explain how to write class methods vs. instance methods. Can you explain the difference between == and ===? Can you explain the difference between call and apply? Explain why Asynchronous code is important in JavaScript? Can you please tell me a story about JavaScript performance problems? Tell me your JavaScript Naming Convention? How do you define a class and its constructor? What is Hoisted in JavaScript? What is function overloadin

25 Best Vue.js 2 Interview Questions and Answers

What Is Vue.js? The Vue.js is a progressive JavaScript framework and used to building the interactive user interfaces and also it’s focused on the view layer only (front end). The Vue.js is easy to integrate with other libraries and others existing projects. Vue.js is very popular for Single Page Applications developments. The Vue.js is lighter, smaller in size and so faster. It also supports the MVVM ( Model-View-ViewModel ) pattern. The Vue.js is supporting to multiple Components and libraries like - ü   Tables and data grids ü   Notifications ü   Loader ü   Calendar ü   Display time, date and age ü   Progress Bar ü   Tooltip ü   Overlay ü   Icons ü   Menu ü   Charts ü   Map ü   Pdf viewer ü   And so on The Vue.js was developed by “ Evan You ”, an Ex Google software engineer. The latest version is Vue.js 2. The Vue.js 2 is very similar to Angular because Evan You was inspired by Angular and the Vue.js 2 components looks like -

nullinjectorerror no provider for httpclient angular 17

In Angular 17 where the standalone true option is set by default, the app.config.ts file is generated in src/app/ and provideHttpClient(). We can be added to the list of providers in app.config.ts Step 1:   To provide HttpClient in a standalone app we could do this in the app.config.ts file, app.config.ts: import { ApplicationConfig } from '@angular/core'; import { provideRouter } from '@angular/router'; import { routes } from './app.routes'; import { provideClientHydration } from '@angular/platform-browser'; //This (provideHttpClient) will help us to resolve the issue  import {provideHttpClient} from '@angular/common/http'; export const appConfig: ApplicationConfig = {   providers: [ provideRouter(routes),  provideClientHydration(), provideHttpClient ()      ] }; The appConfig const is used in the main.ts file, see the code, main.ts : import { bootstrapApplication } from '@angular/platform-browser'; import { appConfig } from '

List of Countries, Nationalities and their Code In Excel File

Download JSON file for this List - Click on JSON file    Countries List, Nationalities and Code Excel ID Country Country Code Nationality Person 1 UNITED KINGDOM GB British a Briton 2 ARGENTINA AR Argentinian an Argentinian 3 AUSTRALIA AU Australian an Australian 4 BAHAMAS BS Bahamian a Bahamian 5 BELGIUM BE Belgian a Belgian 6 BRAZIL BR Brazilian a Brazilian 7 CANADA CA Canadian a Canadian 8 CHINA CN Chinese a Chinese 9 COLOMBIA CO Colombian a Colombian 10 CUBA CU Cuban a Cuban 11 DOMINICAN REPUBLIC DO Dominican a Dominican 12 ECUADOR EC Ecuadorean an Ecuadorean 13 EL SALVADOR

React | Encryption and Decryption Data/Text using CryptoJs

To encrypt and decrypt data, simply use encrypt () and decrypt () function from an instance of crypto-js. Node.js (Install) Requirements: 1.       Node.js 2.       npm (Node.js package manager) 3.       npm install crypto-js npm   install   crypto - js Usage - Step 1 - Import var   CryptoJS  =  require ( "crypto-js" ); Step 2 - Encrypt    // Encrypt    var   ciphertext  =  CryptoJS . AES . encrypt ( JSON . stringify ( data ),  'my-secret-key@123' ). toString (); Step 3 -Decrypt    // Decrypt    var   bytes  =  CryptoJS . AES . decrypt ( ciphertext ,  'my-secret-key@123' );    var   decryptedData  =  JSON . parse ( bytes . toString ( CryptoJS . enc . Utf8 )); As an Example,   import   React   from   'react' ; import   './App.css' ; //Including all libraries, for access to extra methods. var   CryptoJS  =  require ( "crypto-js" ); function   App () {    var   data