tc39-weakrefs-shim/module/utils/set.js

Shim for TC39 Weakrefs proposal

import { combine } from "./iterable.js";
export function intersects(a, b) {
    if (a.size > b.size)
        [b, a] = [a, b];
    for (const elem of a) {
        if (b.has(elem))
            return true;
    }
    return false;
}
export function difference(a, b) {
    let res;
    if (a.size <= b.size) {
        res = new Set();
        for (const info of a) {
            if (!b.has(info))
                res.add(info);
        }
    }
    else {
        res = new Set(a);
        remove(res, b);
    }
    return res;
}
export function merge(dest, ...iterables) {
    for (const item of combine(...iterables)) {
        dest.add(item);
    }
}
export function remove(dest, ...iterables) {
    for (const item of combine(...iterables)) {
        dest.delete(item);
    }
}
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