Warbler Combinator

Duplicates an argument to a binary function. Applies a function to the same argument twice.

export const Warbler = (x: Fn) => (y: Fn) => x(y)(y);
export const W = Warbler;
export const Duplicate = W;

const add = (x: number) => (y: number) => x + y;
const double = Warbler(add);
double(5); // 10 (add(5)(5))

const power = (x: number) => (y: number) => Math.pow(x, y);
const powFn = Warbler(power);
powFn(3); // 27

Wagner-Fischer Edit Distance

Docs

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Warbler Combinator