Please explain _ArrayReverse

[leuce]

Hello everyone

Can anyone please help me understand what is wrong with this script?

#include <Array.au3>

$clippy = "the quick brown fox"

$wordsarray = StringSplit ($clippy, " ", 1)
MsgBox (0, "", $wordsarray[0], 0); <-- just to test to see if it is an array

$wordsarrayreversed = _ArrayReverse ($wordsarray)
MsgBox (0, "", $wordsarrayreversed[0], 0) ; <-- script says $wordsarrayreversed is not an array ???

$newstring = _ArrayToString ($wordsarrayreversed, " ")
MsgBox (0, "", $newstring, 0)

The result should be "fox brown quick the", but I can't get that far.  What am I doing wrong?

Thanks

Samuel

 

[Jos]

Helpfile is your friend  

#include <Array.au3>

$clippy = "the quick brown fox"

$wordsarray = StringSplit ($clippy, " ", 1)
MsgBox (0, "", $wordsarray[0], 0); <-- just to test to see if it is an array

_ArrayReverse ($wordsarray)
MsgBox (0, "", $wordsarray[0], 0) ; <-- script says $wordsarrayreversed is not an array ???

$newstring = _ArrayToString ($wordsarray, " ")
MsgBox (0, "", $newstring, 0)

Jos

[jchd]

@leuce

The array argument is ByRef in the function.

[Nine]

35 minutes ago, jchd said:

The array argument is ByRef in the function.

Array UDF always uses ByRef in its functions, to avoid copying large array, whether the array is returned modified or not...

[leuce]

8 hours ago, Jos said:

Helpfile is your friend  

Yes, but in this case it was a friend that just winked mysteriously.  Anyway, thanks for pointing out what's wrong.

2 hours ago, jchd said:

The array argument is ByRef in the function.

I'm afraid I don't know what that means, but Jos's solution worked, thanks.

[jchd]

A ByRef argument to a function can be modified by its code and doesn't have to be returned explicitely: the calling code will see the changed variable.

Look at the helpfile again: this function doesn't return the reversed array, the passed array is reversed on place.
Read also about ByRef.