I don't know how the OP wants his/her data sorted, but really there is no need for the mySort subroutine. Because, all that that subroutine is doing can be done in a sort block...
Yes, you are right, but I guess that Farang wanted to offer a fix while changing as little as possible from the original code. It is often a dilemma for me (here and on other forums) when I see a clear coding error as well as a number of more or less clumsy or suboptimal things around: should we just give the bug fix to make the program work, toi solve the OP's immediate problem, or should we try to refactor the whole shebang. Sometimes, when I have time, I take the trouble of saying something like this: "your error is there, on this line of code, this is what you need to fix; but, BTW, I would think that it would also be better to (follow the following best practices | use a hash instead of an array (or an array instead of a hash) | work the algorithm the other way around | use the following (cleaner|more robust|faster) syntax | use strict and use warnings | use Perlish loops rather than C-style loops | use tr/// instead of s///g | use index instead of a regex | use map and grep instead of foreach (or foreach instead of map and grep) | whatever | etc.). But I don't always have time and I don't always do it.
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