在Lua中获取嵌套表的结果

当问题包含“嵌套”时，答案可能包含递归：

function printTable(t)

    function printTableHelper(t, spacing)
        for k,v in pairs(t) do
            print(spacing..tostring(k), v)
            if (type(v) == "table") then
                printTableHelper(v, spacing.."\t")
            end
        end
    end

    printTableHelper(t, "");
end

只需注意循环引用即可。

下面是修改后的函数，以获得更好的输出和抽象：

function printTableHelper(t, spacing)
    spacing = spacing or ''

    if type(t) ~= 'table' then
        print(spacing .. tostring(t))
    else
        for k, v in pairs(t) do
            print(spacing .. tostring(k), v)
            if type(v) == 'table' then
                printTableHelper(v, spacing .. '\t')
            end
        end
    end
end

printTableHelper({'a', {'b'}, 'c'})

只需前往 lua-users wiki 上的table serialization页面并选择您喜欢的方法。例如，以下代码处理包括表格循环local a={}; a.t = a在内的所有情况:

-- alt version2, handles cycles, functions, booleans, etc
--  - abuse to http://richard.warburton.it
-- output almost identical to print(table.show(t)) below.
function print_r (t, name, indent)
  local tableList = {}
  function table_r (t, name, indent, full)
    local serial=string.len(full) == 0 and name
        or type(name)~="number" and '["'..tostring(name)..'"]' or '['..name..']'
    io.write(indent,serial,' = ')
    if type(t) == "table" then
      if tableList[t] ~= nil then io.write('{}; -- ',tableList[t],' (self reference)\n')
      else
        tableList[t]=full..serial
        if next(t) then -- Table not empty
          io.write('{\n')
          for key,value in pairs(t) do table_r(value,key,indent..'\t',full..serial) end
          io.write(indent,'};\n')
        else io.write('{};\n') end
      end
    else io.write(type(t)~="number" and type(t)~="boolean" and '"'..tostring(t)..'"'
                  or tostring(t),';\n') end
  end
  table_r(t,name or '__unnamed__',indent or '','')
end