Re^2: appending and array into last element of an array?

OK. that sounds good so far, but if I'm doing this in a looping context, and the next time around the loop, the values of @arrayB change, won't that change all of the references as well?

Also, how could I save the anon array in your second example? setting something equal to the push gives the length of the new array, right? Could I just do

push(@arrayA, [ @arrayB ]);
@new_array = @_;
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would that work?

And thanks for the quick reply.
Matt

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Re^3: appending and array into last element of an array? by ikegami (Patriarch) on Oct 11, 2006 at 16:38 UTC
OK. that sounds good so far, but if I'm doing this in a looping context, and the next time around the loop, the values of @arrayB change, won't that change all of the references as well? It depends on where `@arrayB` is declared. `my @arrayA; my @arrayB; while (...) { @arrayB = ...; push(@arrayA, \@arrayB); # XXX }` [download] `my @arrayA; my @arrayB; while (...) { @arrayB = ...; push(@arrayA, [ @arrayB ]); # Ok }` [download] `my @arrayA; while (...) { my @arrayB = ...; push(@arrayA, \@arrayB); # Ok }` [download] `my @arrayA; while (...) { my @arrayB = ...; push(@arrayA, [ @arrayB ]); # Needlessly creating 3rd array. }` [download] Also, how could I save the anon array in your second example? What does "save" mean? Copy? You already have a copy of the array in @arrayB.	[reply] [d/l] [select]

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Re^3: appending and array into last element of an array?
by ikegami (Patriarch) on Oct 11, 2006 at 16:38 UTC

OK. that sounds good so far, but if I'm doing this in a looping context, and the next time around the loop, the values of @arrayB change, won't that change all of the references as well?

It depends on where @arrayB is declared.

my @arrayA;
my @arrayB;
while (...) {
   @arrayB = ...;
   push(@arrayA, \@arrayB);  # XXX
}
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my @arrayA;
my @arrayB;
while (...) {
   @arrayB = ...;
   push(@arrayA, [ @arrayB ]);  # Ok
}
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my @arrayA;
while (...) {
   my @arrayB = ...;
   push(@arrayA, \@arrayB);  # Ok
}
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my @arrayA;
while (...) {
   my @arrayB = ...;
   push(@arrayA, [ @arrayB ]);  # Needlessly creating 3rd array.
}
[download]

Also, how could I save the anon array in your second example?

What does "save" mean? Copy? You already have a copy of the array in @arrayB.

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