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Re^3: Ruby vs Perl vs LISP; the killer feature lacking in Ruby

by Jenda (Abbot)
on May 21, 2012 at 16:26 UTC ( #971657=note: print w/ replies, xml ) Need Help??


in reply to Re^2: Ruby vs Perl vs LISP; the killer feature lacking in Ruby
in thread Ruby vs Perl vs LISP; the killer feature lacking in Ruby

multifoo sub { $_ * 2}, sub { foo ($_) }, @things;
hoopsy hoops, right?

And now the method body:

sub onefoo { my ($reasonably_named_sub, @params) = @_; whatever; for my $foo (tweaked @params) { $reasonably_named_sub->($foo); } } sub multifoo { my ($toDo, $filter, @params) = @_; whatever; for my $foo (grep $filter->(), tweaked @params) { $toDo->($foo); } }
Yieieiaield anyone?

There is a little syntactic sugar for functions (not methods) in Perl, but the difference between using the sugar and not is tiny. If I need to pass two "pieces of code" into my subroutine, I pass them, I name them and I call them the same way I would if I had just one.

In Ruby, if your method gets a single block/closure parameter, you do not get to name the parameter, you use the ill-named statement yield and it kinda, behind the scenes, maybe, works. If you need to pass two you are, basically, screwed. But then 640KB ought to be ... I mean one block ought to be enough for anybody.

Jenda
Enoch was right!
Enjoy the last years of Rome.


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