rust Currying change a multiple argument function into a function where some of the arguments are preset.
Currying is a technique used in functional programming to transform a function with multiple arguments into a sequence of functions, each taking one argument. This allows you to partially apply arguments to a function, creating a new function with some arguments already preset.
In Rust, you can achieve currying using closures and the move
keyword. Here's an example:
fn add(a: i32) -> impl Fn(i32) -> i32 {
move |b| a + b
}
fn main() {
let add_five = add(5);
let result = add_five(3);
println!("Result: {}", result); // Output: Result: 8
}
In this example, the add
function takes an argument a
and returns a closure that takes another argument b
and returns the sum of a
and b
. By calling add(5)
, we create a new function add_five
where a
is preset to 5
. We can then call add_five(3)
to get the result 8
.
This is a basic example of currying in Rust. You can apply the same technique to functions with more arguments by chaining closures together.