Rust facts & stats

Question 1

What is Rust's official build tool and package manager called?

Accepted Answer

Cargo. Cargo builds Rust projects, runs tests and downloads dependencies.

Question 2

Rust's unofficial crab mascot is named what?

Accepted Answer

Ferris. Ferris the crab is the community mascot, and Rust fans call themselves Rustaceans.

Question 3

In Rust, what does the exclamation mark in println! indicate?

Accepted Answer

It is a macro, not a regular function. Names ending in ! like println! and vec! are macros that expand into code at compile time.

Question 4

What is the part of the Rust compiler that enforces rules about references called?

Accepted Answer

The borrow checker. The borrow checker makes sure references never outlive the data they point to.

Question 5

Instead of null values, Rust usually represents a value that might be missing with which type?

Accepted Answer

Option. Option has two variants: Some(value) or None.

Question 6

Which Rust type is commonly returned by operations that can fail?

Accepted Answer

Result. Result has Ok(value) for success and Err(error) for failure.

Question 7

In Rust, what are traits mainly used for?

Accepted Answer

Defining shared behavior that types can implement. A trait lists methods a type must provide, similar to interfaces in other languages.

The basics