On Thu, Jan 15, 2009 at 12:46:09PM +0300, Richard Hainsworth wrote:
> Larry Wall wrote:
>> On Wed, Jan 14, 2009 at 09:55:38AM +0300, Richard Hainsworth wrote:
>>> However, I came across one thing in solution #3 that I posted 
>>> yesterday.  $pair.fmt("%s %s") is nice, but it doesnt allow for any 
>>> action on either  value or key before printing (I wanted to print the 
>>> value as a  percentage), and this had to be done in a printf 
>>> statement. In fact the  printf statement was the longest and ugliest 
>>> statement in the program.
>> Maybe I'm missing something, but you can always do:
>>     $pair.key.foo.fmt("%s"),
>>     $pair.value.bar.fmt("%s")
>> Larry
> This surely requires that foo and bar are defined as sub's.

It was a notional action, just as the %s is a notional format.
The main point was that you can deref $pair twice.

> Suppose I just need a single transformation of a value before outputting  
> it? Eg., expressing .value as a percentage of $count?
> Is there some way to include a one-off in the subroutine "chain"?  
> Something like
> $pair.value.{shift / 10}.fmt("%s");

Well, I'm sure there's some way to do that, but certainly not
with any existing subscript notation.

Maybe it's better to just use parens:


Admittedly that doesn't interpolate well, which is part of the point
.fmt in the first place, and the way interpolation is defined to
end on brackets of some kind:

    say "My value = $foo.fmt('%d')."

So I guess there's some small need for mapping a scalar value.


which maybe can even be written



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