# Newbie question - ruby equivalence of for loop? **URL:** \ **Category:** Ruby\ **Created:** [April 7, 2007, 12:25am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337 "2007-04-07T00:25:34Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 12:25am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/1 "2007-04-07T00:25:34Z")
is there an equivalence in Ruby for the nested “for loop” in java. i want to complete the following: i is 0 j is 2 j is 4 j is 6 j is 8 i is 1 j is 2 j is 4 j is 6 j is 8 i is 2 j is 2 j is 4 j is 6 j is 8 but want to use Ruby,(i think Rails has a foreach loop).I can do the above in Java but Ruby is still foreign to me.Whats the best method to implement the above? – * * * Posted with NewsLeecher v3.9 Beta 1 Web @ [NewsLeecher - The Complete Usenet Package](http://www.newsleecher.com/?usenet) * * * ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 12:38am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/2 "2007-04-07T00:38:37Z")
On Apr 6, 2007, at 6:25 PM, removed\_email\_address@domain.invalid wrote: > is there an equivalence in Ruby for the nested “for loop” in java. > i want to complete the following: > i is 0 > j is 2 > j is 4 > j is 6 > j is 8 If you are just trying to iterate over the numeric ranges: (0…2).each { |i| 2.step(8, 2) { |j| puts “#{i}, #{j}” } } Gary W. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 1:15am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/3 "2007-04-07T01:15:38Z")
thanks for the code Gary, I’m goin work through it.its quite different from how I implemented the solution in java,(it really is a paradigm shift), thanks again for the reply – * * * Posted with NewsLeecher v3.9 Beta 1 Web @ [NewsLeecher - The Complete Usenet Package](http://www.newsleecher.com/?usenet) * * * ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 1:39am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/4 "2007-04-07T01:39:39Z")
On 4/6/07, removed\_email\_address@domain.invalid [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > How did you do it in Java, might I ask, that might help us help you understand the ruby way. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 3:26am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/5 "2007-04-07T03:26:44Z")
On Apr 6, 2007, at 7:15 PM, removed\_email\_address@domain.invalid wrote: > thanks for the code Gary, I’m goin work through it.its quite > different from how I implemented the > solution in java,(it really is a paradigm shift), thanks again for > the reply This alternative version is a bit simpler. It might be better to understand this one and then go back to my first one: [0,1,2].each { |i| [2,4,6,8].each { |j| puts “#{i}, #{j}” } } Gary W. ---
**Author:** ![unknown](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/u/4bbf92/32.png) [@unknown](https://www.ruby-forum.com/u/unknown)\ **Post date:** [April 7, 2007, 9:01am UTC](https://www.ruby-forum.com/t/newbie-question-ruby-equivalence-of-for-loop/91337/6 "2007-04-07T09:01:00Z")
On 07.04.2007 00:21, removed\_email\_address@domain.invalid wrote: > ``` > j is 6 > j is 8 > i is 2 > j is 2 > j is 4 > j is 6 > j is 8 > > ``` > > but want to use Ruby,(i think Rails has a foreach loop).I can do the above in Java > but Ruby is still foreign to me.Whats the best method to implement the above? irb(main):005:0\> 0.upto 2 do |i| irb(main):006:1\* 2.step 8, 2 do |j| irb(main):007:2\* print i, " ", j, “\n” irb(main):008:2\> end irb(main):009:1\> end 0 2 0 4 0 6 0 8 1 2 1 4 1 6 1 8 2 2 2 4 2 6 2 8 =\> 0 You can also use a for loop for the outer loop: irb(main):010:0\> for i in 0…2 do irb(main):011:1\* puts i irb(main):012:1\> end 0 1 2 =\> 0…2 The scoping is a bit different, i.e. i is known after the loop. Kind regards robert