From: Juan Matias on 7 Jun 2010 23:52 glen wrote: > Just thought I'd post a solution I came up with to finding > combinations (as in, permutations and combinations) of arrays. For > example, combining: > > [1,2] and [3,4,5] > > should return: > > [[1,3],[1,4],[1,5],[2,3],[2,4],[2,5]] > > which is easy enough. But I wanted something that combine several > arrays at once, ie: > > [[1,2],[3,4,5],[6,7]].combine > => [[1, 3, 6], [1, 3, 7], [1, 4, 6], [1, 4, 7], [1, 5, 6], [1, 5, 7], > [2, 3, 6], [2, 3, 7], [2, 4, 6], [2, 4, 7], [2, 5, 6], [2, 5, 7]] > And why not something like: [1,2].combine([3,4]).combine([5,6,7]) I do that with this code: class Array def combine(otherArray) aux = [] self.each do self_elem otherArray.each do other_elem aux << [self_elem,other_elem] end end aux.map {elem elem.flatten } end end Juan Matias  Posted via http://www.rubyforum.com/.
From: Phrogz on 8 Jun 2010 00:11 On Jun 7, 9:52 pm, Juan Matias <jmrepe...(a)gmail.com> wrote: > glen wrote: > > Just thought I'd post a solution I came up with to finding > > combinations (as in, permutations and combinations) of arrays. For > > example, combining: Juan, it would appear that glen posted this question/tip 3.5 years ago. Any reason you were responding to it now? (Which, in turn, lured me into responding. :)
From: Juan Matias on 8 Jun 2010 00:33 Gavin Kistner wrote: > On Jun 7, 9:52�pm, Juan Matias <jmrepe...(a)gmail.com> wrote: >> glen wrote: >> > Just thought I'd post a solution I came up with to finding >> > combinations (as in, permutations and combinations) of arrays. For >> > example, combining: > > Juan, it would appear that glen posted this question/tip 3.5 years > ago. Any reason you were responding to it now? (Which, in turn, lured > me into responding. :) Sure Gavin, I'm looking for something like that and found this post. Maybe result useful to someone. You have another solution for this? Thanks  Posted via http://www.rubyforum.com/.
From: Kamal Ahmed on 8 Jun 2010 01:51 The examples seem to be missing If there is code snippets, it would help. Kamal. ________________________________ From: Juan Matias <jmrepetti(a)gmail.com> To: rubytalk ML <rubytalk(a)rubylang.org> Sent: Tue, June 8, 2010 12:33:24 AM Subject: Re: array and hash combine methods Gavin Kistner wrote: > On Jun 7, 9:52ï¿½pm, Juan Matias <jmrepe...(a)gmail.com> wrote: >> glen wrote: >> > Just thought I'd post a solution I came up with to finding >> > combinations (as in, permutations and combinations) of arrays. For >> > example, combining: > > Juan, it would appear that glen posted this question/tip 3.5 years > ago. Any reason you were responding to it now? (Which, in turn, lured > me into responding. :) Sure Gavin, I'm looking for something like that and found this post. Maybe result useful to someone. You have another solution for this? Thanks  Posted via http://www.rubyforum.com/.
From: Robert Klemme on 8 Jun 2010 03:36 2010/6/8 Juan Matias <jmrepetti(a)gmail.com>: > glen wrote: >> Just thought I'd post a solution I came up with to finding >> combinations (as in, permutations and combinations) of arrays. For >> example, combining: >> >> [1,2] and [3,4,5] >> >> should return: >> >> [[1,3],[1,4],[1,5],[2,3],[2,4],[2,5]] >> >> which is easy enough. But I wanted something that combine several >> arrays at once, ie: >> >> [[1,2],[3,4,5],[6,7]].combine >> => [[1, 3, 6], [1, 3, 7], [1, 4, 6], [1, 4, 7], [1, 5, 6], [1, 5, 7], >> [2, 3, 6], [2, 3, 7], [2, 4, 6], [2, 4, 7], [2, 5, 6], [2, 5, 7]] >> > > And why not something like: > > [1,2].combine([3,4]).combine([5,6,7]) > > I do that with this code: > > class Array > def combine(otherArray) > aux = [] > self.each do self_elem > otherArray.each do other_elem > aux << [self_elem,other_elem] > end > end > aux.map {elem elem.flatten } > end > end I'd rather do this: module Enumerable def combine(enum) if block_given? each do *a enum.each do *b yield *a, *b end end self else enum_for(:combine, enum) end end end [1,2].combine([3,4]) do *a p a end puts "" [1,2].combine([3,4]).each do *a p a end puts "" [1,2].combine([3,4]).combine([5,6]) do *a p a end puts "" [1,2].combine([3,4]).combine([5,6]).each do *a p a end Kind regards robert  remember.guy do as, often as.you_can  without end http://blog.rubybestpractices.com/

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