numbers = _objectWrappers.wrap(_arrays.arrayOf(_plugins.loadClass("java.lang.Long"), 1, 2, 3, 4, 5))
# 计算累积索引加权和, 累积索引加权和: [0, 1, 5, 14, 30, 55]
numbers.runningFoldIndexed(0, lambda index, acc, element: acc + element * (index + 1)).forEach(
    lambda it: _console.log(it))