Function map 

pub fn map<'a, Brand: Functor, A: 'a, B: 'a, F>(
    f: F,
    fa: Apply1L1T<'a, Brand, A>,
) -> Apply1L1T<'a, Brand, B>
where
    F: Fn(A) -> B + 'a,

Maps a function over the values in the functor context.

Free function version that dispatches to the type class’ associated function.

Type Signature

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

Parameters

• f: The function to apply to the value(s) inside the functor.
• fa: The functor instance containing the value(s).

Returns

A new functor instance containing the result(s) of applying the function.

Examples

use fp_library::classes::functor::map;
use fp_library::brands::OptionBrand;

let x = Some(5);
let y = map::<OptionBrand, _, _, _>(|i| i * 2, x);
assert_eq!(y, Some(10));