local dw = _objectWrappers:wrap(_iterables:mutableListOf())
local data = _objectWrappers:wrap(_arrays:arrayOf(_plugins:loadClass("java.lang.String"), "one", nil, "three", "four", nil))
-- 将非空字符串转换为其长度, 非空字符串长度: [3, 5, 4]
data:mapNotNullTo(dw, function(it)
    if (it ~= nil) then
        return _objectWrappers:wrap(it):count()
    else
        return nil
    end

end):forEach(function(it)
    _console:log(it)
end)