rspec users - Jan 2008 - (no subject)

Message-ID:<ef1d468f0801291747q3f605e6cjb73028a888a441ee at
mail.gmail.com>

On: Tue, 29 Jan 2008 20:47:41 -0500, "Andrew WC Brown" <omen.king
at gmail.com>
wrote:
> I''ve seen lambda before but not sure what it does.
A lambda is a fancy name for an anonymous or unbound function.  Its
significance comes from the fact that it is completely stateless, producing no
side effects to its returned result.

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On Jan 29, 2008 8:48 PM, James B. Byrne <byrnejb at harte-lyne.ca>
wrote:
> Message-ID:<ef1d468f0801291747q3f605e6cjb73028a888a441ee at
mail.gmail.com>
>
> On: Tue, 29 Jan 2008 20:47:41 -0500, "Andrew WC Brown"
<omen.king at gmail.com>
> wrote:
>
> > I''ve seen lambda before but not sure what it does.
>
> A lambda is a fancy name for an anonymous or unbound function.  Its
> significance comes from the fact that it is completely stateless, producing
no
> side effects to its returned result.
I don''t know about that...

irb(main):001:0> a = [1,2,3]
=> [1, 2, 3]
irb(main):002:0> def foo(array)
irb(main):003:1> lambda { array.clear }
irb(main):004:1> end
=> nil
irb(main):005:0> fun = foo a
=> #<Proc:0x002842a4@(irb):3>
irb(main):006:0> fun.call
=> []
irb(main):007:0> a
=> []

Yeah, I thought that lambdas supported closures, so they hold their state
and you can pass it around.

-Corey

On Jan 29, 2008 11:55 PM, Pat Maddox <pergesu at gmail.com> wrote:
> On Jan 29, 2008 8:48 PM, James B. Byrne <byrnejb at harte-lyne.ca>
wrote:
> > Message-ID:<ef1d468f0801291747q3f605e6cjb73028a888a441ee at
mail.gmail.com>
> >
> > On: Tue, 29 Jan 2008 20:47:41 -0500, "Andrew WC Brown" <
> omen.king at gmail.com>
> > wrote:
> >
> > > I''ve seen lambda before but not sure what it does.
> >
> > A lambda is a fancy name for an anonymous or unbound function.  Its
> > significance comes from the fact that it is completely stateless,
> producing no
> > side effects to its returned result.
>
> I don''t know about that...
>
> irb(main):001:0> a = [1,2,3]
> => [1, 2, 3]
> irb(main):002:0> def foo(array)
> irb(main):003:1> lambda { array.clear }
> irb(main):004:1> end
> => nil
> irb(main):005:0> fun = foo a
> => #<Proc:0x002842a4@(irb):3>
> irb(main):006:0> fun.call
> => []
> irb(main):007:0> a
> => []
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-- 
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