Owl Combinator

Self-application with reversed order. Creates recursive patterns where the function receives its own result.

export const Owl = (x: Fn) => (y: Fn) => y(x(y));
export const O = Owl;
export const RecursiveApply = O;

// Example 1
const apply = (x: any) => x;
const identity = (x: any) => x;
Owl(apply)(identity); // identity

// Example 2
const counter = (n: number) => (f: Fn) => n;
const counterFn = Owl(counter(5));
// counterFn is a function expecting another function
const double = (x: number) => x * 2;
expect(counterFn(double)).toEqual(10);

const addOne = (x: number) => x + 1;
expect(counterFn(addOne)).toEqual(6);

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Owl Combinator