nj88udd02 at sneakemail
Nov 23, 2009, 5:43 AM
Post #2 of 3
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Hi John,
John W. Krahn wrote:
> I was thinking about a possible modification for a foreach loop.
>
> Normally in a foreach loop the list or array is aliased to the scalar
> variable after the 'foreach' keyword or to $_ if no variable is
> specified, for example:
[...]
> But suppose that you just wanted to use a foreach loop to count and were
> not intending to use the contents of the aliased scalar variable. Could
> Perl be modified to do this:
>
> foreach undef ( 1 .. 5 ) {
> # do something five times without alias
> }
>
> Or:
> my @array = 'a' .. 'd';
> foreach undef ( @array ) {
> # do something @array times without alias
> }
I think it shouldn't be that hard to do (just guessing), but I don't
really see the use case. By simply ignoring $_, you get virtually the
same effect. I see two reasons to want this:
a) Performance optimization. Seems like a very small win for adding
additional syntax
b) Propagating $_ from an outer loop. Seems like a really bad use of $_.
The outer loop should be using a named loop variable.
What's your use case?
Cheers,
Steffen
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