# Syntax translation Java - Ruby **URL:** \ **Category:** Ruby\ **Created:** [September 29, 2009, 6:24pm UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368 "2009-09-29T18:24:44Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 29, 2009, 6:24pm UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/1 "2009-09-29T18:24:44Z")
have this code in Java: boolean monkey = true; for(i=0; monkey; i++){ if(index[i] == null) { put.something.new(i); break; } } I am aware that it makes no sense by itself so I will explain. I am iterating through a (Sequel) database nodes. I am looking for a node I.D. that is not being used. Basically, I am looking for and open parking spot. When I find one, I insert my new data using the newly found parking spot. I really can’t figure out why I need to uniquely identify each node by an I.D. as it is already uniquely identified by location in the tree but that is a different matter entirely. All I need is how to write a nice infinite ‘for’ loop in Ruby. ---
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 29, 2009, 7:11pm UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/2 "2009-09-29T19:11:07Z")
On Tue, Sep 29, 2009 at 5:24 PM, Jake Brightmatter [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > I am aware that it makes no sense by itself so I will explain. I am > iterating through a (Sequel) database nodes. I am looking for a node > I.D. that is not being used. Basically, I am looking for and open > parking spot. When I find one, I insert my new data using the newly > found parking spot. I really can’t figure out why I need to uniquely > identify each node by an I.D. as it is already uniquely identified by > location in the tree but that is a different matter entirely. All I > need is how to write a nice infinite ‘for’ loop in Ruby. loop {} > – > Posted via [http://www.ruby-forum.com/](http://www.ruby-forum.com/). – Paul S. [http://www.nomadicfun.co.uk](http://www.nomadicfun.co.uk) removed\_email\_address@domain.invalid ---
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 30, 2009, 4:10am UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/3 "2009-09-30T04:10:59Z")
On Sep 29, 12:32 pm, Paul S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > for(i=0; monkey; i++){ > > found parking spot. I really can’t figure out why I need to uniquely > > Paul S.[http://www.nomadicfun.co.uk](http://www.nomadicfun.co.uk) > > removed\_email\_address@domain.invalid An alternate way while true do # your code # break if end removed\_email\_address@domain.invalid ---
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 30, 2009, 5:02am UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/4 "2009-09-30T05:02:30Z")
On Sep 29, 2009, at 09:24 , Jake Brightmatter wrote: > I am aware that it makes no sense by itself so I will explain. I am > iterating through a (Sequel) database nodes. I am looking for a node > I.D. that is not being used. Basically, I am looking for and open > parking spot. When I find one, I insert my new data using the newly > found parking spot. I really can’t figure out why I need to uniquely > identify each node by an I.D. as it is already uniquely identified by > location in the tree but that is a different matter entirely. All I > need is how to write a nice infinite ‘for’ loop in Ruby. No, that’s what you THINK you want because you’re coming from java… index is a bad name for a collection, so I’m going to call it parking\_spots. parking\_spots.each\_with\_index do |parking\_spot, i| next if parking\_spot parking\_spots[i] = my\_car break end but honestly if you’re doing this against a sequel db, you’re it wrong. You should use the power of the DB instead of doing tons of roundtrips in ruby. ---
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 30, 2009, 5:41am UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/5 "2009-09-30T05:41:08Z")
On Tue, Sep 29, 2009 at 11:24 AM, Jake Brightmatter [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)wrote: > I am aware that it makes no sense by itself so I will explain. I am I know you are asking about the Ruby, but in your Java code, using the variable monkey is rather confusing, and doesn’t seem to have any purpose except to hold the value true, to submit to the conditional portion of your for loop. This isn’t necessary, as you can directly place true into that location: for( i=0 ; true ; ++i ) ---
**Author:** ![mark42](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/65b543/32.png) [@mark42](https://www.ruby-forum.com/u/mark42)\ **Post date:** [September 30, 2009, 2:21pm UTC](https://www.ruby-forum.com/t/syntax-translation-java-ruby/176368/6 "2009-09-30T14:21:34Z")
Ryan D. wrote: > but honestly if you’re doing this against a sequel db, you’re it > wrong. You should use the power of the DB instead of doing tons of > roundtrips in ruby. Right - what you want is: SELECT id+1 FROM table AS t WHERE NOT EXISTS(SELECT \* FROM table AS n WHERE t.id+1 = n.id) LIMIT 1 that is, find (just the first) successor of the first id that doesn’t have a successor. Otherwise just “SELECT max(id)+1 from table” if you don’t need to fill vacated spots.