@exadel/esl/modules/esl-utils/misc/set.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

export function intersection(a, b, ...rest) {
    if (arguments.length < 2)
        return a ? a.slice() : [];
    if (rest.length)
        return intersection(a, intersection(b, ...rest));
    return a.filter(Set.prototype.has, new Set(b));
}
/** Create an array with unique values from each of the passed arrays */
export function union(...rest) {
    const set = new Set();
    rest.forEach((item) => item.forEach((i) => set.add(i)));
    return [...set];
}
export function complement(a, b, ...rest) {
    if (!b)
        return a ? a.slice() : [];
    if (rest.length > 1)
        return complement(a, complement(b, ...rest));
    const setB = new Set(b);
    return a.filter((element) => !setB.has(element));
}
/**
 * @returns if the passed arrays have a full intersection
 * Expect uniq values in collections
 */
export function fullIntersection(a, b) {
    if (a.length === 0 && b.length === 0)
        return true;
    const [larger, smaller] = a.length >= b.length ? [a, b] : [b, a];
    const set = new Set(larger);
    return !smaller.filter((item) => !set.has(item)).length;
}