Method next

src/Map.js:631–666

()

  }

  next() {
    const type = this._type;
    let stack = this._stack;
    while (stack) {
      const node = stack.node;
      const index = stack.index++;
      let maxIndex;
      if (node.entry) {
        if (index === 0) {
          return mapIteratorValue(type, node.entry);
        }
      } else if (node.entries) {
        maxIndex = node.entries.length - 1;
        if (index <= maxIndex) {
          return mapIteratorValue(
            type,
            node.entries[this._reverse ? maxIndex - index : index]
          );
        }
      } else {
        maxIndex = node.nodes.length - 1;
        if (index <= maxIndex) {
          const subNode = node.nodes[this._reverse ? maxIndex - index : index];
          if (subNode) {
            if (subNode.entry) {
              return mapIteratorValue(type, subNode.entry);
            }
            stack = this._stack = mapIteratorFrame(subNode, stack);
          }
          continue;
        }
      }
      stack = this._stack = this._stack.__prev;
    }
    return iteratorDone();
  }
}

function mapIteratorValue(type, entry) {