Function compose3 

pub fn compose3<A, B, C, D, F, G, H>(f: F, g: G, h: H) -> impl Fn(A) -> D
where
    F: Fn(C) -> D,
    G: Fn(B) -> C,
    H: Fn(A) -> B,

Backward composition of three functions.

Arguments

• f - A function that takes a value in C and returns a value in D
• g - A function that takes a value in B and returns a value in C
• h - A function that takes a value in A and returns a value in B

Returns

A new function that takes a value in A and returns a value in D