Perl: Why is it slower to declare (my) variables inside a loop?

Question

What\'s the difference, from the interpreter\'s POV, between the following the following programs:

#!/usr/bin/perl -w

use strict;

for (1..10000000) {
    m         


        

Answer 1

The first loop attempts to make the variable declaration for every iteration of the loop and can result in unnecessary processing time.

Granted, it's not much, but this stuff can add up over time, and it is technically slower since more instructions are executed per iteration.