perl qw - what is?

Perl Qw:
perl qw is quoted words, it is useful for declaring arrays, instead of writing quotes for each strings, we can use qw to minimize it.

Qw Delimiter:

1.space(Recommended and default)
2.comma
3.comment




But using space will be easier to process a array and that is recommended and default.

as per perldoc, below methods are equal.

1. qw(STRING)   <=>  split(" ", q/STRINGS/);
2. qw(STRING)   <=> "STRING1","STRING2";


Method 1:

@array = qw/perl scripting is popular/;

Method 2: using []

@array = qw[perl scripting is popular];

Method 3: using ()

@array = qw(perl scripting is popular);

Method 4:

using  space delimiter with comma or comment