[−][src]Crate higher_order_functions
A small collection of traits for implementing higher order functions.
Init:
use higher_order_functions::Init; struct House { number: usize } // [T; N]: Init<T, usize> let road = <[House; 3]>::init(|i| House { number: i + 1 }); assert_eq!(road[0].number, 1); assert_eq!(road[1].number, 2); assert_eq!(road[2].number, 3);
Map:
use higher_order_functions::Map; let arr = [1, 4, 6, -3, 6].map(|x| x * 2); assert_eq!(arr, [2, 8, 12, -6, 12]);
use higher_order_functions::Map; let arr = [1, 4, 6, -3, 6].map(f64::from); assert_eq!(arr, [1.0, 4.0, 6.0, -3.0, 6.0]);
Zip:
use higher_order_functions::Zip; let a = [1, 2, 3]; let b = ["a", "b", "c"]; let arr = a.zip(b, |ax, bx| (ax, bx)); assert_eq!(arr, [(1, "a"), (2, "b"), (3, "c")]);
use higher_order_functions::Zip; let a = [1, 2, 3]; let b = [4, 5, 6]; let arr = a.zip(b, |ax, bx| ax * bx); assert_eq!(arr, [4, 10, 18]);
Section:
use higher_order_functions::Section; let a: [u32; 8] = [1, 2, 3, 4, 5, 6, 7, 8]; let arr: [u32; 4] = a.section(3); // Extracts 4 elements starting at a[3] assert_eq!(arr, [4, 5, 6, 7]);
To use this, add it as a dependency to your Cargo.toml:
[dependencies]
higher_order_functions = "^0.1.1"
Traits
Init | Types which can be initialised by applying a function to each 'index' of the type. |
Map | Types containing 'inner' values which can be mapped over. |
Section | Operator to retrieve a fixed-size section of an array-like structure. |
Zip | Zip two collections using a function to combine pairs of elements. |