1.9's New Methods
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From: Intransition on 15 Apr 2010 07:06 First a big shout-out to Marc-Andre Lafortune and his <a href="http:// github.com/marcandre/backports">backports</a> project. Nice work. Now I want to ask if others have noticed all the new methods being add to 1.9+? I'm quite happy about vast majority of it, but there was at least one method I thought pretty peculiar. This Enumerable method: def flat_map(&block) return to_enum(:flat_map) unless block_given? map(&block).flatten(1) end unless method_defined? :flat_map Backports.alias_method self, :collect_concat, :flat_map I am very curious to know how it was decided that a normal map followed by a 1-deep flatten is common enough to warrant its own method? Two in fact!
From: Ryan Davis on 15 Apr 2010 07:30 On Apr 15, 2010, at 4:06 AM, Intransition <transfire(a)gmail.com> wrote: > First a big shout-out to Marc-Andre Lafortune and his <a href="http:// > github.com/marcandre/backports">backports</a> project. Nice work. > > Now I want to ask if others have noticed all the new methods being add > to 1.9+? I'm quite happy about vast majority of it, but there was at > least one method I thought pretty peculiar. This Enumerable method: > > def flat_map(&block) > return to_enum(:flat_map) unless block_given? > map(&block).flatten(1) > end unless method_defined? :flat_map > Backports.alias_method self, :collect_concat, :flat_map > > I am very curious to know how it was decided that a normal map > followed by a 1-deep flatten is common enough to warrant its own > method? Two in fact! i use Hash[*collection.map {...}.flatten] all the time.
From: Intransition on 15 Apr 2010 07:47 On Apr 15, 7:30 am, Ryan Davis <ryand-r...(a)zenspider.com> wrote: > i use Hash[*collection.map {...}.flatten] all the time. I see. But really? So now you will use: Hash[*collection.flat_map {...}] But that explains why this would never have occurred to me. I use: collection.map {...}.to_h Thanks.
From: Michael Fellinger on 15 Apr 2010 07:54 On Thu, Apr 15, 2010 at 8:30 PM, Ryan Davis <ryand-ruby(a)zenspider.com> wrote: > > On Apr 15, 2010, at 4:06 AM, Intransition <transfire(a)gmail.com> wrote: > >> First a big shout-out to Marc-Andre Lafortune and his <a href="http:// >> github.com/marcandre/backports">backports</a> project. Nice work. >> >> Now I want to ask if others have noticed all the new methods being add >> to 1.9+? I'm quite happy about vast majority of it, but there was at >> least one method I thought pretty peculiar. This Enumerable method: >> >> Â def flat_map(&block) >> Â Â return to_enum(:flat_map) unless block_given? >> Â Â map(&block).flatten(1) >> Â end unless method_defined? :flat_map >> Â Backports.alias_method self, :collect_concat, :flat_map >> >> I am very curious to know how it was decided that a normal map >> followed by a 1-deep flatten is common enough to warrant its own >> method? Two in fact! > > i use Hash[*collection.map {...}.flatten] all the time. > > Hash[[1,2,3].map{|i| [i,i*2]}] # {1=>2, 2=>4, 3=>6} RUBY_DESCRIPTION # "ruby 1.9.1p378 (2010-01-10 revision 26273) [x86_64-linux]" -- Michael Fellinger CTO, The Rubyists, LLC
From: James Edward Gray II on 15 Apr 2010 09:34
On Apr 15, 2010, at 6:30 AM, Ryan Davis wrote: > i use Hash[*collection.map {...}.flatten] all the time. Me too, but it's needed less in 1.9 I think. Hash[ ] now accepts an Array of Arrays. James Edward Gray II |