Comments on: Expand Your Twitter Network In Less Than 15 Lines of Ruby http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/ with Jerod Santo Wed, 10 Mar 2010 04:47:48 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: sandal http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-388 sandal Mon, 18 May 2009 19:48:49 +0000 http://blog.jerodsanto.net/?p=330#comment-388 It's because of object allocation. inject doesn't accumulate into a single collection, but instead produces a new one every iteration. This is also true of Array#+ but less of a concern. Object creation (and GC) are very slow in Ruby. It's because of object allocation. inject doesn't accumulate into a single collection, but instead produces a new one every iteration. This is also true of Array#+ but less of a concern. Object creation (and GC) are very slow in Ruby.

]]> By: Jerod Santo http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-387 Jerod Santo Mon, 18 May 2009 19:40:56 +0000 http://blog.jerodsanto.net/?p=330#comment-387 Yes, I suppose it is. It's also a little easier to read. But why would it be *much* faster than using inject? Is it because adding arrays is slow but flattening an array of arrays is not? Yes, I suppose it is. It's also a little easier to read. But why would it be *much* faster than using inject? Is it because adding arrays is slow but flattening an array of arrays is not?

]]> By: sandal http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-386 sandal Mon, 18 May 2009 19:31:03 +0000 http://blog.jerodsanto.net/?p=330#comment-386 Isn't:<br><br>my_friends.inject(Array.new) { |array,id| array += Twitter.friend_ids(id); array }<br><br>the same as<br><br>my_friends.map { |id| Twitter.friend_ids(id) }.flatten <br><br>(The latter should be *much* faster).<br><br>Otherwise, very cool little script. Isn't:

my_friends.inject(Array.new) { |array,id| array += Twitter.friend_ids(id); array }

the same as

my_friends.map { |id| Twitter.friend_ids(id) }.flatten

(The latter should be *much* faster).

Otherwise, very cool little script.

]]> By: sandal http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-217 sandal Mon, 18 May 2009 12:48:49 +0000 http://blog.jerodsanto.net/?p=330#comment-217 It's because of object allocation. inject doesn't accumulate into a single collection, but instead produces a new one every iteration. This is also true of Array#+ but less of a concern. Object creation (and GC) are very slow in Ruby. It's because of object allocation. inject doesn't accumulate into a single collection, but instead produces a new one every iteration. This is also true of Array#+ but less of a concern. Object creation (and GC) are very slow in Ruby.

]]> By: sant0sk1 http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-216 sant0sk1 Mon, 18 May 2009 12:40:56 +0000 http://blog.jerodsanto.net/?p=330#comment-216 Yes, I suppose it is. It's also a little easier to read. But why would it be *much* faster than using inject? Is it because adding arrays is slow but flattening an array of arrays is not? Yes, I suppose it is. It's also a little easier to read. But why would it be *much* faster than using inject? Is it because adding arrays is slow but flattening an array of arrays is not?

]]> By: sandal http://blog.jerodsanto.net/2009/05/expand-your-twitter-network-in-less-than-15-lines-of-ruby/comment-page-1/#comment-215 sandal Mon, 18 May 2009 12:31:03 +0000 http://blog.jerodsanto.net/?p=330#comment-215 Isn't:<br><br>my_friends.inject(Array.new) { |array,id| array += Twitter.friend_ids(id); array }<br><br>the same as<br><br>my_friends.map { |id| Twitter.friend_ids(id) }.flatten <br><br>(The latter should be *much* faster).<br><br>Otherwise, very cool little script. Isn't:

my_friends.inject(Array.new) { |array,id| array += Twitter.friend_ids(id); array }

the same as

my_friends.map { |id| Twitter.friend_ids(id) }.flatten

(The latter should be *much* faster).

Otherwise, very cool little script.

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