Hummingbird Combinator

Distributes an argument to two positions (fork pattern). Useful for applying the same value to multiple function calls.

export const Hummingbird = (x: Fn) => (y: Fn) => (z: Fn) => x(y)(z)(y);
export const H = Hummingbird;
export const Couple = H;

const makeAdder = (x: number) => (y: number) => (z: number) => x + y + z;
const fork = Hummingbird(makeAdder)(5)(3); // 13