Starling

Substitution/dependency injection pattern. Distributes an argument to both a function and its argument function.

export const Starling = (x: Fn) => (y: Fn) => (z: Fn) => x(z)(y(z));
export const S = Starling;
export const Substitute = S;

const add = (x: number) => (y: number) => x + y;
const double = (x: number) => x * 2;
const substitute = Starling(add)(double);
substitute(5); // 15

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