rust currying, preset some arguments
To curry a function in Rust and preset some arguments, you can use closures or the partial_fn
crate. Here's an example using closures:
fn add(a: i32, b: i32) -> i32 {
a + b
}
fn main() {
let add_5 = |b| add(5, b);
println!("Result: {}", add_5(3)); // Output: Result: 8
}
In this example, we define a function add
that takes two arguments and returns their sum. We then create a closure add_5
that captures the value 5
and takes a single argument b
. When add_5
is called with an argument, it invokes the add
function with the preset value of 5
and the provided argument b
.
Alternatively, you can use the partial_fn
crate to achieve currying in Rust. Here's an example using the partial_fn
crate:
use partial_fn::partial;
fn add(a: i32, b: i32) -> i32 {
a + b
}
partial!(add_5: add, 5);
fn main() {
println!("Result: {}", add_5(3)); // Output: Result: 8
}
In this example, we use the partial_fn
crate to create a partial function add_5
that is a curried version of the add
function with the first argument preset to 5
. When add_5
is called with an argument, it invokes the original add
function with the preset value of 5
and the provided argument b
.
Please note that the partial_fn
crate is a third-party crate and needs to be added to your Cargo.toml
file for it to work.