in reply to Re^6: Out of Memory
in thread Out of Memory

how does ... differ in execution from ...

Hm. "in execution"?

  1. The result -- the count -- is the same.
  2. The runtime is less than half:
    $s = 'ab'x 10e6;; cmpthese -1, { a => q[ my $n = 0; while( $s =~ m[ab]g ){ $n++ }; ], b=>q[ my $n = 0; ++$n while $s =~ m[ab]g; ], };; s/iter a b a 2.31 -- -37% b 1.45 59% --
  3. It is easier to read.

Don't use post increment if you aren't using the pre-increment value. Don't create scopes you don't need.

Or, get into the habit of not doing anything you don't need to.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

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Re^8: Out of Memory
by Michael Kittrell (Novice) on Mar 28, 2013 at 22:33 UTC
    Thank you for the very thorough explanation and proof.

    If you don't know where you're going, it doesn't matter when you get there.