Execute Lua Online

function toJson(obj) 
   local r = ''
   local ia = false
   
   for k, v in pairs(obj) do
       if r ~= '' then
           r = r .. ','
       end
       
       if type(k) == 'string' then
           r = r .. utf8.char(0x0022)
           r = r .. k
           r = r .. utf8.char(0x0022) .. ':'
       else
           ia = true
       end
       
       if type(v) == 'table' then
          r = r .. toJson(v)
       elseif type(v) == 'string' then
           r = r .. utf8.char(0x0022)
           r = r .. v
           r = r .. utf8.char(0x0022)
       else 
           r = r .. v 
       end
   end
   
   if ia then
       return '[' .. r .. ']'
   else
       return '{' .. r .. '}'
   end
end


function func(l)
    ml = 5
    if l > ml or l < 0 then
        l = ml
    end
    
    nl = l + 1
    
    obj = {}
    obj.maxLevel = ml
    
    obj.speed = 5
    
    obj.housingSpace = 1
    obj.attackRange = 1
    
    obj.hitPoints = 10 * l
    obj.healthPoints = 100 * l

    obj.buildTime =  100 * l
    obj.upgradeTime =  100 * nl
    
    bc = {}
    bc.gold = (28500 * math.pow (l, 2)) - (77500 * l) + 51000
    obj.buildCost = bc

    uc = {}
    uc.gold = (28500 * math.pow (nl, 2)) - (77500 * nl) + 51000
    obj.upgradeCost = uc

    obj.trainingTime =  10 * l
    
    tc = {}
    tc.gas = 10 * l
    obj.trainingCost = tc

    return obj
end


print (toJson(func(1)))