lua 学习笔记（1）

function values(t)
  local i = 0
  return function()
    i = i + 1
    return t[i]
  end
end
 
t = {10, 20, 30}
for element in values(t)
do
  print(element)
end
local iterator
function allwords()
  local state = {line = io.read(), pos = 1}
  return iterator, state
end

function iterator(state)
  while state.line do
    local s, e = string.find(state.line, "%w+", state,pos)
    if s
    then
      state.pos = e + 1
      return string.sub(state.line, s, e)
    else
      state.line = io.read()
      state.pos = 1
    end
  end
  return nil
end