@jsoldi/hkt/dist/types/set.js

Higher kinded types for typescript and a few utility monads.

import { monadPlus } from "../classes/monadPlus.js";
/** The set module, providing a set of functions for working with sets. */
export const set = (() => {
    const union = (fa) => (fb) => fa.union(fb);
    const intersection = (fa) => (fb) => fa.intersection(fb);
    const difference = (fa) => (fb) => fa.difference(fb);
    const symmetricDifference = (fa) => (fb) => fa.symmetricDifference(fb);
    const isSubsetOf = (fa) => (fb) => fa.isSubsetOf(fb);
    const isSupersetOf = (fa) => (fb) => fa.isSupersetOf(fb);
    const isDisjointFrom = (fa) => (fb) => fa.isDisjointFrom(fb);
    const unit = (a) => new Set([a]);
    const bind = (fa, f) => new Set([...fa].flatMap(a => [...f(a)]));
    const map = (fa, f) => new Set([...fa].map(f));
    return {
        ...monadPlus({
            unit,
            bind,
            map,
            empty: () => new Set(),
            append: (fa, fb) => fa.union(fb),
        }),
        union,
        intersection,
        difference,
        symmetricDifference,
        isSubsetOf,
        isSupersetOf,
        isDisjointFrom
    };
})();
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