Method next

lib/util/TupleSet.js:147–165

(it)

		 * @returns {boolean} result
		 */
		const next = (it) => {
			const result = it.next();
			if (result.done) {
				if (iteratorStack.length === 0) return false;
				tuple.pop();
				return next(
					/** @type {IteratorStack<T, V>} */
					(iteratorStack.pop())
				);
			}
			const [key, value] = result.value;
			iteratorStack.push(it);
			tuple.push(key);
			if (value instanceof Set) {
				currentSetIterator = value[Symbol.iterator]();
				return true;
			}
			return next(value[Symbol.iterator]());
		};

		next(this._map[Symbol.iterator]());