Perl Arrays
- http://perldoc.perl.org/index-functions-by-cat.html#Functions-for-real-@ARRAYs
- http://modernperlbooks.com/books/modern_perl_2014/03-perl-language.html#YXJyYXlz
Fundamental operations
# Declare array
my @elements = ('one', 'two', 'tree', 'four');
# Access elements
say $elements[0];
say $elements[1];
say $elements[2];
say $elements[3];
# Get array size
say 'Number of elements: ' . @elements;
See http://modernperlbooks.com/books/modern_perl_2014/03-perl-language.html#QXJyYXlBc3NpZ25tZW50
Element manipulation
- pop: remove and return the last element
- shift: remove and return the first element
- push: add element(s) at the tail
- unshift: add element(s) at the top
See http://perlmaven.com/manipulating-perl-arrays
Sort elements
Sort acending:
my @ascending_sorted_list = sort {$a <=> $b} @original_list;
Sort descending:
my @descending_sorted_list = sort {$b <=> $a} @original_list;
Using a custom sort function:
sub cmp_value
{
return $a <=> $b;
}
my @sorted_elements = sort cmp_value @elements;
See http://perldoc.perl.org/functions/sort.html
Miscellaneous
- grep
- join: Create a string out of an array
- map
- qw//
- reverse
- unpack