Function fold_map 

pub fn fold_map<'a, FnBrand, Brand: Foldable, A: 'a + Clone, M, Func>(
    func: Func,
    fa: <Brand as Kind_cdc7cd43dac7585f>::Of<'a, A>,
) -> M
where
    M: Monoid + 'a,
    Func: Fn(A) -> M + 'a,
    FnBrand: CloneableFn + 'a,

Maps values to a monoid and combines them.

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

Type Signature

forall brand a m. (Foldable brand, Monoid m) => (a -> m, brand a) -> m

Type Parameters

• 'a: The lifetime of the elements.
• FnBrand: The brand of the cloneable function to use.
• Brand: The brand of the foldable structure.
• A: The type of the elements in the structure.
• M: The type of the monoid.
• Func: The type of the mapping function.

Parameters

• func: The function to map each element to a monoid.
• fa: The structure to fold.

Returns

The combined monoid value.

Examples

use fp_library::{brands::*, functions::*};

let x = Some(5);
let y = fold_map::<RcFnBrand, OptionBrand, _, _, _>(|a: i32| a.to_string(), x);
assert_eq!(y, "5".to_string());