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comp.lang.ruby

Enumerable Procs?

Joe Edelman

1/29/2005 4:49:00 PM

Hi Folks,

Is there any way to get something like this to work?

class Proc
def to_ary(ct)
a = []
l = lambda { |x|
a << x
ct -= 1
break if ct == 0
}
call(&l)
return a
end
end

p lambda {
yield 1
yield 2
yield 3
yield 4
yield 5
yield 6
yield 7
}.to_ary(5)

# would like this to be [1, 2, 3, 4, 5]

Thanks,

--Joe

--
Joe Edelman
2 Answers

Florian Gross

1/29/2005 5:19:00 PM

0

Joe Edelman wrote:

> Is there any way to get something like [Proc#call with an attached
> block] to work?

Not in Ruby 1.8, because Procs don't have a block slot there. E.g. you
can't do lambda { yield }.call { puts "foo" }. This does however work
in Ruby 1.9.

Until then you might be able to work around your problem by not using
yield (you could pass a callback to the block) or not using a Proc.

Trans

1/29/2005 5:33:00 PM

0

| class Proc
| def to_ary(ct)
| a = []
| l = lambda { |x|
| return if ct == 0
| a << x
| ct -= 1
| }
| call(l)
| return a
| end
| end
|
| p proc { |yld|
| yld.call 1
| yld.call 2
| yld.call 3
| yld.call 4
| yld.call 5
| yld.call 6
| yld.call 7
| }.to_ary(5)

T.