--- Luke Palmer <[EMAIL PROTECTED]> wrote:
> > Date: Wed, 08 Jan 2003 12:14:10 +0800
> > From: Damian Conway <[EMAIL PROTECTED]>
> >
> > Can I suggest that an alternative solution might be the following:
> >
> > Suppose Perl 6 had two new very low precedence operators: ~> and <~
> > (a.k.a. "bind rightwards" and "bind leftwards")
> >
> > Suppose ~> takes its left argument and binds it to
> > the end of the argument list of its right argument,
> > then evaluates that right argument and returns the result.
> > So an L2R array-processing chain is:
> >
> > @out = @a ~> grep {...} ~> map {...} ~> sort;
> >
> > There might also be a be special rule that, if the RHS is
> > a variable, the LHS is simply assigned to it. Allowing:
> >
> > @a ~> grep {...} ~> map {...} ~> sort ~> @a;
> >
> > Further suppose that <~ takes its right argument, and binds
> > it in the indirect object slot of the left argument, which
> > argument it then calls. So an R2L array-processing chain is:
> >
> > @out = sort <~ map {...} <~ grep {...} <~ @a;
> >
> > Or, under a special rule for variables on the LHS:
> >
> > @out <~ sort <~ map {...} <~ grep {...} <~ @a;
> >
> > That way, everything is still a method call, the ultra-low precedence of
> > <~ and ~> eliminate the need for parens, and (best of all) the
> expressions
> > actually *look* like processing sequences.
>
> I think this is a big step towards readability. It allows you to put
> whatever part of the expression wherever you want (reminiscent of
> Latin); i.e. always keep the important parts standing out. I also
> think that the operator (especially a cool 3d-looking one like ~>) is
> also much more readable than a word in this case.
I don't like either of these operators. What's wrong with "@out = sort map
{...} grep {...} @a"?
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