jsmodern/dist/set/difference.js

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

import { utilIsSet } from './is-set';
export const difference = {
    label: 'difference',
    fn: function setDifference(other) {
        const ctx = this;
        if (!utilIsSet(other))
            throw new TypeError(`Expect 'other' to be a Set`);
        if (!ctx.size && !other.size)
            return [];
        const diffList = [];
        for (const n of ctx) {
            if (other.has(n))
                continue;
            diffList.push(n);
        }
        return diffList;
    },
};
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