Proc and lambda

ruby-talk
1

What is the difference between proc function and lambda function when
they both create new Proc object? Is there any guidelines for
preferring one over another?

2

Provided of course, I know the differences between Proc.new and lambda
~ both proc and lambda seems to behave the way, whereas, Proc.new
behaves slightly differently.

3

Provided of course, I know the differences between Proc.new and lambda
~ both proc and lambda seems to behave the way, whereas, Proc.new
behaves slightly differently.

Well, if you think that proc and lambda behave the same, you'll have a
surprise one day :slight_smile:

moulon% ./ruby -ve 'proc { break }.call'
ruby 1.9.0 (2006-09-21) [i686-linux]
-e:1: break from proc-closure (LocalJumpError)
  from -e:1:in `Proc#call'
  from -e:1
moulon%

moulon% ./ruby -ve 'lambda { break }.call'
ruby 1.9.0 (2006-09-21) [i686-linux]
moulon%

Guy Decoux

4

> Provided of course, I know the differences between Proc.new and lambda
> ~ both proc and lambda seems to behave the way, whereas, Proc.new
> behaves slightly differently.

Well, if you think that proc and lambda behave the same, you'll have a
surprise one day :slight_smile:

moulon% ./ruby -ve 'proc { break }.call'
ruby 1.9.0 (2006-09-21) [i686-linux]
-e:1: break from proc-closure (LocalJumpError)
        from -e:1:in `Proc#call'
        from -e:1
moulon%

moulon% ./ruby -ve 'lambda { break }.call'
ruby 1.9.0 (2006-09-21) [i686-linux]
moulon%

which means , if I remember correctly:
1.8 Proc.new != proc, proc == lambda
1.9 Proc.new == proc, proc!=lambda
right?

Robert

Guy Decoux

···

On 9/22/06, ts <decoux@moulon.inra.fr> wrote:

--
Deux choses sont infinies : l'univers et la bêtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein

5

1.8 Proc.new != proc, proc == lambda
1.9 Proc.new == proc, proc!=lambda

yes,

Guy Decoux

6

> 1.8 Proc.new != proc, proc == lambda
> 1.9 Proc.new == proc, proc!=lambda

yes,

Guy Decoux

Thx Guy

···

On 9/22/06, ts <decoux@moulon.inra.fr> wrote:
--
Deux choses sont infinies : l'univers et la bêtise humaine ; en ce qui
concerne l'univers, je n'en ai pas acquis la certitude absolue.

- Albert Einstein