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 
";}

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 
";} 
Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

your company's audio

4 Areas of Your Company Where Your Audio Really Matters

Your company probably relies on audio more than you realize. Whether you’re creating a spoken text message to a colleague or giving a speech, you want your audio to shine. Otherwise, you could cause avoidable friction points and potentially hurt your brand reputation. For example, let’s say you create a

chrome os developer mode

How to Turn on Chrome OS Developer Mode

Google’s Chrome OS is a popular operating system that is widely used on Chromebooks and other devices. While it is designed to be simple and user-friendly, there are times when users may want to access additional features and functionality. One way to do this is by turning on Chrome OS

homes in the real estate industry

Exploring the Latest Tech Trends Impacting the Real Estate Industry

The real estate industry is changing thanks to the newest technological advancements. These new developments — from blockchain and AI to virtual reality and 3D printing — are poised to change how we buy and sell homes. Real estate brokers, buyers, sellers, wholesale real estate professionals, fix and flippers, and beyond may