Method find

javascript/0684-redundant-connection.js:66–78

(node, { parent } = this)

    }

    find(node, { parent } = this) {
        let head = parent[node];

        const isEqual = () => head === parent[head];
        while (!isEqual()) {
            const tail = parent[parent[head]];

            this.compress(head, tail);
            head = parent[head];
        }

        return head;
    }

    compress(tail, head, { parent } = this) {
        parent[tail] = head;