Lua有状态迭代器

  
 
 

   
  
  
#!/usr/bin/luaprint("haicoder()\n")
   
  
  
array = {"Hello", "HaiCoder", "Lua"}
   
  
  
function elementIterator (collection)
   
  
  
local index = 0
   
  
  
local count = #collection
   
  
  
-- 闭包函数
   
  
  
return function ()
   
  
  
index = index + 1
   
  
  
if index <= count
   
  
  
then
   
  
  
-- 返回迭代器的当前元素
   
  
  
return collection[index]
   
  
  
end
   
  
  
end
   
  
  
end
   
  
  
for element in elementIterator(array)
   
  
  
do
   
  
  
print(string.format("Element = %s", element))
   
  
  
end