Order of indices in for k, v in array-style loop

[wpb]

Hi there,
I've checked the docs, but I can't find a definitive answer. So...
In an array with purely integer keys, is a

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for index, value in array

loop guaranteed to iterate over those indices in ascending order?
Thanks.
(I'd like to know for both v1 and v2 of AHK, if someone can enlighten me.)

[mikeyww]

I know a way to find out.

Code: Select all

#Requires AutoHotkey v1.1.33
arr1 := { 1 : "A",  100 : "B",  1000 : "C",  20 : "D"}
arr2 := {"1": "A", "100": "B", "1000": "C", "20": "D"}
For each, arr in [arr1, arr2] {
 For k, v in arr
  Send % v
 Send `n
}

---

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#Requires AutoHotkey v2.0
arr1 := Map( 1 , "A",  100 , "B",  1000 , "C",  20 , "D")
arr2 := Map("1", "A", "100", "B", "1000", "C", "20", "D")
For each, arr in [arr1, arr2] {
 For k, v in arr
  Send v
 Send '`n'
}

[wpb]

Thanks for the code. I do appreciate you taking the time to provide that. But what I'd really like to know is: is that /guaranteed/ by the language spec. In other words, can I rely on it even in future versions?

[just me]

'Plain arrays' with purely integer keys (v1.1) and Array objects (v2) are iterated in ascending order. Currently it's /guaranteed/ by the language spec, but who knows?

[wpb]

If it's in the documentation that it's guaranteed, then I'd expect it to remain guaranteed (even in v2, since that's now the official version). Can you point me to where in the documentation it says so? Many thanks!

[mikeyww]

I did not see it in the docs, but it is known for simple arrays, which always have numeric keys.

[wpb]

Okay, thanks!

[DrReflex]

Great example. I like this modification even better. Both show how in arr1 the keys are numeric and are accessed sequentially in numerical order (A,D,C,B) and in arr2 the keys are strings and are accessed sequentially in alphabetically sorted order (E,G,F,H)

Code: Select all

#Requires AutoHotkey >=2.0-<2.1
#SingleInstance Force

arr1 := Map( 1 , "A",  1000 , "B",  100 , "C",  20 , "D")
arr2 := Map("1", "E", "1000", "F", "100", "G", "20", "H")
For each, arr in [arr1, arr2] {
 For key, var in arr
  MsgBox var
}

Esc:: {
	ExitApp()
}