In Perl, how can I sort records using numbers that appear before the first colon (:)?

Question

I have the following sequence of data in Perl:

143:0.0209090909090909 
270:0.0909090909090909 
32:0.0779090909090909 
326:0.3009090909090909

Please, how can I sort them based on the numbers before the colon, to get this as my output?

32:0.0779090909090909
143:0.0209090909090909
270:0.0909090909090909  
326:0.3009090909090909

Answer 1

It does not matter that there are colons there.

Perl's rules for converting strings to numbers will just do The Right Thing:

#!/usr/bin/perl
use warnings;
use strict;

my @nums = qw(
    143:0.0209090909090909 
    270:0.0909090909090909 
    32:0.0779090909090909 
    326:0.3009090909090909
);

{ no warnings 'numeric';
    @nums = sort {$a <=> $b} @nums;
}

print "$_\n" for @nums;