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    Sequence in Gideros Studio Output window

    DikkesnoekDikkesnoek Member
    edited August 2012 in General questions
    Hi,

    Still learning Lua. I tried the for loop with a keypairs combination to understand. I tried this:
    local testTable = {}
 
for i = 89, 100 do
	test = string.format("%d", i - 87)
	testTable[test] = i
end
 
for key, value in pairs(testTable) do
	print(key, value)
end
    The output window will give the following values:
    3 90
    2 89
    5 92
    4 91
    7 94
    6 93
    9 96
    8 95
    13 100
    12 99
    11 98
    10 97

    I expected something like:
    2 89
    3 90
    4 91
    5 92
    ...

    Isn't this weird?

    Regards,

    Marc


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    Comments

    • zvardinzvardin Member
      That's something to do with Lua. The pairs() function in my understanding will not necessarily return key/value in any specific order, which kind of makes sense since a key could be anything from a table, function, etc.

      If you are using normal numerical indexes though starting with 1, ipairs() should return them in order.

      Likes: atilim

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    • john26john26 Maintainer
      Personally I don't use the advanced "for in" loop just the basic for loop. Then you can index directly (provided your keys are numbers, as in your example):
      for i=1,10 do
  a[i]=i+1
end
 
for i=1,10 do
  print (i,a[i])
end
      This old fashioned method gives you complete control and (IMO) is much more readable.
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    • techdojotechdojo Guru
      Actually it's also faster and more efficient as well, guess us old timers still have a few things to teach you young whippersnappers :)

      Likes: talis

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    • DikkesnoekDikkesnoek Member
      I like the old style too but I think that handling objects with keys can be powerful like I've seen in Objective-C. For simple loops you can use the standard form.

      Marc
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