Implement an Iterated For Loop
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local function myfor(iterator, callback)
while true do
local returns = {iterator()}
if #returns == 0 then break end
callback(unpack(returns))
end
end
-- Value iterator
local function justvalues(t)
local index = 0
return function()
index = index + 1
return t[index]
end
end
-- Index value iterator
local function justipairs(t)
local length = #t
local index = 0
return function()
index = index + 1
local value = t[index]
if index <= length then
return index, value
else
return
end
end
end
-- Example
local a = {"Bob","Mark","Jessie","Greg","Alice"}
myfor(justvalues(a), print)
myfor(justipairs(a), print)
Lua
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