rust Archives - IT Nursery

haskell, Programming

IT Nursery

What is the difference between traits in Rust and typeclasses in Haskell?

Traits in Rust seem at least superficially similar to typeclasses in Haskell, however I’ve seen people write that there are some differences between ...

June 2, 2022
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Programming, rust

IT Nursery

What is this question mark operator about?

I’m reading the documentation for File: //.. let mut file = File::create("foo.txt")?; //.. What is the ? in this line? I do not ...

June 2, 2022
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Programming, string

IT Nursery

Why is it discouraged to accept a reference to a String (&String), Vec (&Vec), or Box (&Box) as a function argument?

I wrote some Rust code that takes a &String as an argument: fn awesome_greeting(name: &String) { println!("Wow, you are awesome, {}!", name); } ...

June 2, 2022
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Programming, string

IT Nursery

What is the equivalent of the join operator over a vector of Strings?

I wasn’t able to find the Rust equivalent for the “join” operator over a vector of Strings. I have a Vec<String> and I’d ...

May 29, 2022
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Programming, rust

IT Nursery

How can a Rust program access metadata from its Cargo package?

How do you access a Cargo package’s metadata (e.g. version) from the Rust code in the package? In my case, I am building ...

May 28, 2022
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file-io, Programming

IT Nursery

What’s the de-facto way of reading and writing files in Rust 1.x?

With Rust being comparatively new, I’ve seen far too many ways of reading and writing files. Many are extremely messy snippets someone came ...

May 26, 2022
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How can I include a module from another file from the same project?

By following this guide I created a Cargo project. src/main.rs fn main() { hello::print_hello(); } mod hello { pub fn print_hello() { println!("Hello, ...

May 25, 2022
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How do I create a global, mutable singleton?

What is the best way to create and use a struct with only one instantiation in the system? Yes, this is necessary, it ...

May 24, 2022
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What is the syntax for a multiline string literal?

I’m having a hard time figuring out how string syntax works in Rust. Specifically, I’m trying to figure out how to make a ...

May 23, 2022
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Why is there a large performance impact when looping over an array with 240 or more elements?

When running a sum loop over an array in Rust, I noticed a huge performance drop when CAPACITY >= 240. CAPACITY = 239 ...

May 22, 2022
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