Perl6 Loop Constructs

http://use.perl.org/~masak/journal/40442?from=rss

by someone_here • 16 years ago

25 11 16 years ago

use.perl.org

protomyth2• 16 years ago

The "repeat while EXPR { ... }" seems kinda goofy that it still evaluates after the loop runs once.

someone_here• 16 years ago

Not if you think of it as "do this but repeat while EXPR"

EDIT: Perhaps renaming it to "again while EXPR { ... }" would be a better option.

ekiru• 16 years ago

On the plus side, since Perl 6's spec is not set in stone; goofy things like that can still be gotten rid of.

masak2• 16 years ago

Yes; just go to the #perl6 channel on freenode, request a commit bit, and edit it out of the spec.

For this particular change though, I think you will meet a bit of resistance. Many people might agree that the feature is goofy, but few will probably agree that it's bad and should be gotten rid of.

baddox2• 16 years ago

I don't think so. The first evaluation of the body is a given, the "repeat" means to do it more times while the EXPR is true.

protomyth2• 16 years ago

It just seems like "repeat while EXPR { ... }" would check EXPR before the loop and the other order "repeat { ... } while EXPR" would check check the EXPR after each loop. Not a big deal, but just kinda goofy (as in ordering doesn't mean evaluation ordering).

wvenable• 16 years ago

I agree, only because the difference is pretty subtle:

    while EXPR { ... }
    repeat while EXPR { ... }

This does two different things and the word "repeat" doesn't really imply the difference in semantics.

masak2• 16 years ago

The difference isn't more subtle than the difference between $x + $y and $x - $y.

Finster• 16 years ago

This kind of stuff is why I love Perl. I just wish I still had an excuse to use it on a daily basis...

Perl6 Loop Constructs

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