Space character when using push function on arrays

iamravikanth has asked for the wisdom of the Perl Monks concerning the following question:

Hi Monks, Whenever I use a simple push function on an array. i get a space character in front of the elements starting at index 1. Below is an example.

my @array;
$i=0;
while($i<5)
{
    push(@array,$i);
    push(@array,"\n");
    $i++;
}
print "@array";

Result :

0 
 1 
 2 
 3 
 4
[download]

Could anyone kindly explain why this is happening and what is the solution to this. Regards, Ravi.

Comment on Space character when using push function on arrays Download Code

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Re: Space character when using push function on arrays by roboticus (Chancellor) on Jul 15, 2010 at 11:13 UTC
lamravikanth: No it doesn't, try this: `my @array; $i=0; while($i<5) { push(@array,$i); $i++; } print join("\|",@array);` [download] You're getting confused by the stringification of an array. In other words, expanding the array inside a double-quoted string is adding the spaces. ...roboticus	[reply] [d/l]
Re: Space character when using push function on arrays by FunkyMonk (Bishop) on Jul 15, 2010 at 11:21 UTC
Printing `"@array"` is not the same as printing `@array`: `my @array = 1..5; print @array, "\n"; # 12345 print "@array \n"; # 1 2 3 4 5` [download] Update: Removed a spurious comma. Thanks ikegami	[reply] [d/l] [select]
Re: Space character when using push function on arrays by Anonymous Monk on Jul 15, 2010 at 11:15 UTC
Because you're interpolating the array, so all the items are joined using the list separator ( see perlvar $") `@stuff = 1 .. 10; print "@stuff\n"; __END__ 1 2 3 4 5 6 7 8 9 10` [download]	[reply] [d/l]
Re: Space character when using push function on arrays by nvivek (Vicar) on Jul 15, 2010 at 12:13 UTC
You're getting that output because the value $" by default is space.That's why,you're getting 0\n then space which $" is a delimiter and then 1\n followed by space and it continues. If you want to check it,you change the value of $" and check it.You'll understand.To know better about these kind of special variables you refer this URL. http://www.tutorialspoint.com/perl/perl_special_variables.htm	[reply]
Re: Space character when using push function on arrays by TedPride (Priest) on Jul 15, 2010 at 19:11 UTC
`my (@arr, $i); for $i (0..4) { push @arr, $i, "\n"; } print join '', @arr;` [download]	[reply] [d/l]
Re^2: Space character when using push function on arrays by iamravikanth (Novice) on Jul 15, 2010 at 19:57 UTC
Thanks a lot monks, it resolved the issue.	[reply]