@jsoldi/hkt/dist/classes/functor.js

Higher kinded types for typescript and a few utility monads.

import { id } from "../core/utils.js";
const is_functor = Symbol("is_functor");
function _functor(base) {
    if (is_functor in base)
        return base;
    const fmap = (f) => (fa) => base.map(fa, f);
    const nestFunctor = (g) => {
        return _functor({
            map: (fa, f) => base.map(fa, ga => g.map(ga, f))
        });
    };
    return {
        ...{ [is_functor]: true },
        fmap,
        nestFunctor,
        ...base
    };
}
_functor.const = () => _functor({ map: id });
/** The functor factory, providing a set of functions for working with functors. */
export const functor = _functor;
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