# Exit in a bloc DRY way **URL:** \ **Category:** Ruby\ **Created:** [February 18, 2007, 12:45pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974 "2007-02-18T12:45:19Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 12:45pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/1 "2007-02-18T12:45:19Z")
I wrote this code that’s running well… origin = false contact.each {|c| origin = true if c.from == parameter } nb -= 1 if origin is there any way to write it in one line ? (exiting from the bloc when the condition is true) something like : contact.each {|c| nb -= 1; exit; if c.from == parameter } tfyl joss ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:03pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/2 "2007-02-18T13:03:21Z")
Hi, I think this should do the job nb-=1 if contact.select{|c| c==parameter}.any? it will return nb-1 if any contact matches parameter, or nil if none match cheers, Dave ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:07pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/3 "2007-02-18T13:07:21Z")
Isn’t #find better than #select? select wouldn’t break the first time a match was found, find would. Less time, less memory. Aur S. ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:06pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/4 "2007-02-18T13:06:21Z")
A google turns up this: In Ruby, break exits the block with value “nil”. The caller must check after each closure call to see if the value returned was “nil”, and break itself, if necessary. A side effect is that you can’t return “nil” from a block without terminating the calling structure. (As it happens, this is almost always acceptable.) Use IRB to figure if indeed the standard methods that accept blocks do this checking. contact.each {|c| nb -= 1; exit; if c.from == parameter } # the second ; is definitely wrong Perhaps you meant: contact.each {|c| if c.from == parameter; nb -= 1; break; end } Well, if each is defined and the Enumerable mixin is mixed in (it usually is), you get #find for free, so: ## $ ri Enumerable#find -------------------------------------------------------- Enumerable#f ind enum.detect(ifnone = nil) {| obj | block } =\> obj or nil enum.find(ifnone = nil) {| obj | block } =\> obj or nil * * * ``` Passes each entry in _enum_ to _block_. Returns the first for wh ``` ich _block_ is not +false+. If no object matches, calls _ifnone_ and returns its result when it is specified, or returns +nil+ ``` (1..10).detect {|i| i % 5 == 0 and i % 7 == 0 } #=> nil (1..100).detect {|i| i % 5 == 0 and i % 7 == 0 } #=> 35 ``` So how about: nb = -1 if contact.find{|c| c.from == parameter } ? This seems good. Plug: Have a look at the adopt-a-newbie thread Aur S. ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:18pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/5 "2007-02-18T13:18:22Z")
On 2/18/07, SonOfLilit [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > cheers, > > Dave > > Isn’t #find better than #select? > > select wouldn’t break the first time a match was found, find would. > Less time, less memory. > > Aur S. I’d do: nb-=1 if contact.any?{|c| c.from==parameter} Regards, George. ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:21pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/6 "2007-02-18T13:21:22Z")
> Isn’t #find better than #select? Yes, I think you are correct. I am learning too and had not come across find before. Thankyou for the information. Cheers, Dave ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:26pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/7 "2007-02-18T13:26:23Z")
On 2/18/07, George O. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I’d do: > > nb-=1 if contact.any?{|c| c.from==parameter} > > Regards, > George. Wow, #any? can do this? Thanks for teaching me a cool idiom! On 2/18/07, Sharon P. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Yes, I think you are correct. > I am learning too and had not come across find before. Thankyou for > the information. > > Cheers, > Dave Then let me repeat that plug: Check out the adopt-a-newbie thread please 🙂 Aur S. ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 1:45pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/8 "2007-02-18T13:45:26Z")
On 2007-02-18 13:05:29 +0100, SonOfLilit [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) said: > $ ri Enumerable#find > > > ``` > > contact.each {|c| origin = true if c.from == parameter } > > nb -= 1 if origin > > > > ``` > > > > is there any way to write it in one line ? (exiting from the bloc when > > the condition is true) > > something like : > > contact.each {|c| nb -= 1; exit; if c.from == parameter } > > > > tfyl > > > > joss thanks a lot !! I love Ruby for that… start from one point … and logically go to the DRY way… with Rubist help… where is this thread ‘adopt a newbie’ … ? joss ---
**Author:** ![Josselin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/9de0a6/32.png) [@Josselin](https://www.ruby-forum.com/u/Josselin)\ **Post date:** [February 18, 2007, 2:16pm UTC](https://www.ruby-forum.com/t/exit-in-a-bloc-dry-way/85974/9 "2007-02-18T14:16:27Z")
Here in the list. How do you read the list? Myself, I’m subscribed to it in my gmail account and have it all in a label, so for me it’s simply in the first page. If you can’t find it, google for ruby adopt-a-newbie. Aur S.