Rust programming language Interview Questions & Answers

Question 1. What Is Rust Programming?

Answer :

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

Question 2. How Fast Is Rust?

Answer :

It is very fast, Rust is already competitive with idiomatic C and C++.

Question 3. Is Rust Garbage Collected?

Answer :

No, One of Rust’s key innovations is guaranteeing memory safety without requiring garbage collection.

Question 4. How Do I Get Command Line Arguments In Rust?

Answer :

The easiest way is to use Args that provides an iterator over the input arguments.

Question 5. Is Rust Object Oriented?

Answer :

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

Question 6. Does Rust Have Move Constructors?

Answer :

No, The values of all types are moved via memcpy.

Question 7. What Are The Disadvantages?

Answer :

• Rust compilation seems slow
• Rust has a moderately-complex type system
• 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

Question 8. Does Rust Do Tail-call Optimization?

Answer :

Not, Rust code can be compiled without the standard library; In that case the runtime is roughly equivalent to C programming.

Question 9. What String Type Should You Use?

Answer :

The string types -

• Slice type
• str - UTF-8
• OsStr - OS-compatible
• CStr - C-compatible
• Owned type
• String - UTF-8
• OsString - OS-compatible
• CString - C-compatible

Question 10. What Are The Differences Between The Two Different String Types?

Answer :

• The “String” is an owned buffer of UTF-8 bytes allocated on the heap.
• The “Strings” are 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.

Question 11. How Do I Read A File Into A String?

Answer :

By using the read_to_string() method, which is defined on the Read trait in std::io.

Question 12. What Are The Rules For Using Self, & Self, Or & Mut Self In A Method Declaration?

Answer :

• 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.

Question 13. How Do I Do Asynchronous Input/output In Rust?

Answer :

There are several libraries providing asynchronous input/output in Rust i.e.

1. mio
2. tokio
3. mioco
4. coio-rs
5. rotor
6. And so on

Question 14. What Is The Deal With Unwrap() Everywhere?

Answer :

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.

Question 15. How Do I Do Global Variables In Rust?

Answer :

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.

Question 16. Does Rust Guarantee A Specific Data Layout?

Answer :

Not by default, Most of the general case, the enum and struct layouts are undefined.

Question 17. How Do I Write An Opengl App In Rust?

Answer :

The glium is a library for OpenGL programming in Rust and GLFW is also a solid option.

Question 18. How Can I Write A Gui Application In Rust?

Answer :

There are different ways to write GUI applications in Rust.

The List of -

• Cocoa
• GTK
• gyscos
• ImGui
• IUP and so on

Question 19. How Do I Cross-compile In Rust?

Answer :

It is possible but need a bit of work to set up.

Question 20. What Is The Relationship Between A Module And A Crate?

Answer :

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.