jsmodern/dist/set/is-subset.js

An extension to existing JavaScript, influenced by other great languages such as Rust, Dart, Java, Golang, etc.

import { utilIsSet } from './is-set.js';
export const isSubset = {
    label: 'isSubset',
    fn: function setIsSubset(other) {
        const ctx = this;
        if (!utilIsSet(other))
            throw new TypeError(`Expect 'other' to be a Set`);
        if (!ctx.size && !other.size)
            return true;
        for (const n of ctx)
            if (!other.has(n))
                return false;
        return true;
    },
};
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