Blackbird Combinator

Composes a unary function with a binary function. Useful for composing functions where the second function takes two arguments.

export const Blackbird = (f: Fn) => (g: Fn) => (a: Fn) => (b: Fn) => f(g(a)(b));
export const BL = Blackbird;
export const Chain = BL;

const add = (x: number) => (y: number) => x + y;
const double = (x: number) => x * 2;
const doubleSum = Blackbird(double)(add);
doubleSum(3)(4); // 14

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Bluebird Combinator

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Blackbird Combinator