push ELEMENTS of array to an array using Perl

Question

using Perl I am trying to push the elements of an array to another array, and not the whole array. But I'm not getting my goal.

I tried this:

push @tmp_entities_all, @tmp_entities;

But I got the whole small array as an element in the bigger array.

Then I tried it with a loop:

for (@tmp_entities) {push @tmp_entities_all, $_;}

But the same results, the whole @tmp_entities appears as an element, and that what I dont want.

I need one dimension in the array and not array of arrays!! Should I cast something before pushing? or what is the problem?

Thanx a lot.

Both methods should work. Try to dump your @tmp_entities_all after push by use Data::Dumper; print Dumper(\@tmp_entities_all); and include the output in your question. — Lee Duhem
– Lee Duhem, Commented Apr 11, 2014 at 9:12
[ { 'type' => 'month', 'attr' => { } } ], [ { 'type' => 'day', 'attr' => { } }, { 'type' => 'day', 'attr' => { } } ],... — abounnour
– abounnour, Commented Apr 11, 2014 at 9:18
try this oneliner perl -e '@a=(1,2,3,4); @b=(5,6,7,8); push @a,@b; print "@a\n";' as you can see what you are asking should work — Vorsprung
– Vorsprung, Commented Apr 11, 2014 at 9:19
The loop is working now: I've changed it to @$_ instead of simply $_.. But the other method is more effective and should somehow work.. — abounnour
– abounnour, Commented Apr 11, 2014 at 9:20
Your array @tmp_entities contains an arrayreference, that is holding the elements. Perhaps you defined your array like that @tmp_entities = [ 1, 2, 3] ... but you should do @tmp_entities = ( 1, 2, 3 ) ... This is, why your loop works with @$_ and your push in the first try push the arrays "as one element" ... — user3112922
– user3112922, Commented Apr 11, 2014 at 9:26

user3112922 · Accepted Answer · 2014-04-11 09:33:10Z

1

Out of your comments, its obvious, that @tmp_entities contains only one element, that is an array reference to the elements that you expected to be elements of @tmp_entities.

So you perhaps declared your array with an array refence instead of using a set of elements.

The line

push @tmp_entities_all, @tmp_entities;

definitly works for a normal array.

In your case, your could try ...

push @tmp_entities_all, $tmp_entities[0];

or you simply try to initialize your array with its value like

my @tmp_entities = ( 1, 2, 3 ); # initialize array with 3 elements of type int

instead of

my @tmp_entities = [ 1, 2, 3 ]; # initialize array with 1 element that is an array reference with 3 elements of type int

I know, that this is the case, because this is why your for-loop sample works with @$_ ;D (it is equivalent to push @tmp_entities_all, $tmp_entities[0]; in this situation).

answered Apr 11, 2014 at 9:33

user3112922

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1 Comment

Filippo Lauria Over a year ago

another way could be to use: my @tmp_entities = qw/1 2 3/;.

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