Function map 

pub fn map<'a, Brand: Functor, F, A: 'a, B: 'a>(
    f: F,
    fa: <Brand as Kind_c3c3610c70409ee6>::Of<'a, A>,
) -> <Brand as Kind_c3c3610c70409ee6>::Of<'a, 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

Type Parameters

• Brand: The brand of the functor.
• F: The type of the function to apply.
• A: The type of the value(s) inside the functor.
• B: The type of the result(s) of applying the function.

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));