Login | Register   
RSS Feed
Download our iPhone app
Browse DevX
Sign up for e-mail newsletters from DevX

By submitting your information, you agree that devx.com may send you DevX offers via email, phone and text message, as well as email offers about other products and services that DevX believes may be of interest to you. DevX will process your information in accordance with the Quinstreet Privacy Policy.

Tip of the Day
Language: Web
Expertise: Advanced
Jan 22, 1999



Application Security Testing: An Integral Part of DevOps

Sorting a Two-Dimensional Array With <=>

The Perl sort function is useful for alphabetically sorting lists. However, you can't use it on a list of lists, because once a list starts listing other lists, they cease to be lists and become references instead. By sorting arrays within arrays, it's possible to gain relational database-like control over data grids.

For example, let's say I have a list of lists called @biglist. To print all of its unsorted contents, I would write:

for $list_ref ( @biglist ) {
	print "@$list_ref \n";
To sort @biglist by the first element in each list, I would write:
for $list_ref ( sort { $a->[0] <=> $b->[0] } @biglist ) {
    print " @$list_ref \n";
Steve Renaker
Comment and Contribute






(Maximum characters: 1200). You have 1200 characters left.



Thanks for your registration, follow us on our social networks to keep up-to-date