Binary inorder traversal using generator (and its babel-transpiled)

babel-inorder.js

var _marked = [inorder].map(regeneratorRuntime.mark);

function inorder(t) {
  return regeneratorRuntime.wrap(function inorder$(_context2) {
    while (1) {
      switch (_context2.prev = _context2.next) {
        case 0:
          if (t) {
            _context2.next = 2;
            break;
          }

          return _context2.abrupt("return");

        case 2:
          return _context2.delegateYield(inorder(t.left), "t0", 3);

        case 3:
          _context2.next = 5;
          return t;

        case 5:
          return _context2.delegateYield(inorder(t.right), "t1", 6);

        case 6:
        case "end":
          return _context2.stop();
      }
    }
  }, _marked[1], this);
}

inorder.js

function* inorder(t) {
  if(!t) return
  yield* inorder(t.left)
  yield t
  yield* inorder(t.right)
}