Rust Interview Questions

Last Updated: 2023-09-19

Why Rust?

• syntactically similar to C++, but can guarantee memory safety.
• achieves memory safety without garbage collection.

Crucial features:

• move semantics
• minimal runtime
• trait-based generics
• zero cost abstractions
• pattern matching
• type inference.

What are Modules in Rust?

• Importing Modules with use
• Re-exporting with pub use

What are "Cargo" and "Crate" in Rust?

• Cargo: a build system and package manager.
• Crate: a library or package.

Each crate has an implicit root module that contains the code for that crate. You can then define a tree of sub-modules under that root module. Modules allow you to partition your code within the crate itself.

Methods vs Associated Functions

You can have two kinds of procedures: methods and associated functions.

• methods: exists inside the struct implementation and receives the &self parameter, indicating that it needs to be called by an instance with a ..
• associated functions: called without an instance, it can be compared with the Java static functions. They are normally are used as a constructor of instances.

Name some Rust projects?

• https://github.com/denoland/deno: A modern runtime for JavaScript and TypeScript.
• https://github.com/swc-project/swc: A javascript/typescript compiler, used by Next.js.
• https://github.com/bevyengine/bevy: A refreshingly simple data-driven game engine built in Rust.
• https://github.com/uutils/coreutils: coreutils written in Rust.

Trending Rust projects on GitHub: https://github.com/trending/rust

When to use &self, self and &mut self?

• &self: when read-only reference is rquired.
• self: when a value is to be consumed by the function.
• &mut: when a value needs to be mutated by the function.