Function map

pub fn map<Brand, F, A, B>(
    f: F,
) -> impl Fn(Apply<Brand, (A,)>) -> Apply<Brand, (B,)>
where
    Brand: Kind<(A,)> + Kind<(B,)> + Functor,
    F: Fn(A) -> B,

Maps a function over the values in the functor context.

Free function version that dispatches to the typeclass method.

Type Signature

forall f a b. Functor f => (a -> b) -> f a -> f b

Parameters

• f: A function to apply to the values within the functor context.
• fa: A functor containing values of type A.

Returns

A functor containing values of type B.

Examples

use fp_library::{brands::OptionBrand, functions::map};

assert_eq!(map::<OptionBrand, _, _, _>(|x: i32| x * 2)(Some(5)), Some(10));