numbers = _objectWrappers.wrap(_arrays.arrayOf(_plugins.loadClass("java.lang.Long"), 1, 2, 3, 4, 5))
# 计算所有元素的索引加权和
weightedSum = numbers.foldIndexed(0, lambda index, acc, element: acc + element * (index + 1))
# 输出：索引加权和: 55
_console.log("索引加权和: ", weightedSum)