# Proc and lambda **URL:** \ **Category:** Ruby\ **Created:** [September 22, 2006, 2:11pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626 "2006-09-22T14:11:05Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 2:11pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/1 "2006-09-22T14:11:05Z")
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? ---
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 2:21pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/2 "2006-09-22T14:21:06Z")
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. ---
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 2:27pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/3 "2006-09-22T14:27:07Z")
> > > > > “S” == Sourav [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes: S\> Provided of course, I know the differences between Proc.new and lambda S\> ~ both proc and lambda seems to behave the way, whereas, Proc.new S\> behaves slightly differently. Well, if you think that proc and lambda behave the same, you’ll have a surprise one day 🙂 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 ---
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 3:21pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/4 "2006-09-22T15:21:14Z")
On 9/22/06, ts [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > 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 > – 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 ---
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 4:13pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/5 "2006-09-22T16:13:22Z")
On 9/22/06, ts [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Thx Guy – 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 ---
**Author:** ![sourav](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/a4c791/32.png) [@sourav](https://www.ruby-forum.com/u/sourav)\ **Post date:** [September 22, 2006, 3:33pm UTC](https://www.ruby-forum.com/t/proc-and-lambda/69626/6 "2006-09-22T15:33:16Z")
> > > > > “R” == Robert D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes: R\> 1.8 Proc.new != proc, proc == lambda R\> 1.9 Proc.new == proc, proc!=lambda yes, Guy Decoux