What are the differences between functions and closures in Rust?

What are the differences between functions and closures in Rust?

In Rust, functions are defined with a specific signature and can be called by their name, while closures are anonymous functions that can capture their environment.

Can you give me an example of a closure in Rust?

Sure! Here's a simple closure that adds two numbers:

let add = |a, b| a + b;
let result = add(5, 3);
println!("Result: {}", result);

How do closures capture variables from their environment?

Closures can capture variables by reference or by value, depending on how they are used. This allows them to access variables from their surrounding scope.

Are there any performance differences between using functions and closures?

Yes, closures can introduce some overhead due to capturing variables, while functions are generally more efficient since they don't capture any state.