1 unstable release
0.1.0 | Mar 30, 2020 |
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#2924 in Rust patterns
5KB
curry-macro
Have fun currying using Rust's native closure syntax.
Example
You can curry an add function that adds two numbers.
First, import the curry macro:
use curry_macro::curry;
Then, you have three forms of function definitions to choose from:
- Simplest form, without any type annotations. You need to use the curried function so that the rust compiler can infer the input and return types for you:
let add = curry!(|a, b| a + b);
assert_eq!(add(1)(2), 3);
- With input type annotations:
let add = curry!(|a: i32, b: i32| a + b);
- With input and return type annotations and a block as function body
let add = curry!(|a: i32, b: i32| -> i32 { a + b });
The above three functions work the same:
// You can generate intermediate functions that are partially applied:
let add1_to = add(1);
let sum = add1_to(2);
assert_eq!(sum, 3);
// You can also can apply all arguments at once:
let sum = add(1)(2);
assert_eq!(sum, 3);
Credits
Big thanks to Korede-TA for his awesome curry-macro.
License
MIT