Comments on: Performance with Scala Arrays and Lists http://blog.semergence.com/2007/06/22/performance-with-scala-arrays-and-lists/ Seth Ladd's blog about Ruby on Rails and crunching data. Sat, 10 Jan 2009 03:00:03 +0000 http://wordpress.org/?v=MU hourly 1 By: sethladd http://blog.semergence.com/2007/06/22/performance-with-scala-arrays-and-lists/#comment-197 sethladd Sat, 23 Jun 2007 17:56:52 +0000 http://204.14.242.104/?p=611#comment-197 <p>Using the ::: method is going to be slower than using :: anyway, as some other tests I've done seem to indicate.</p> Using the ::: method is going to be slower than using :: anyway, as some other tests I’ve done seem to indicate.

]]> By: David Illsley http://blog.semergence.com/2007/06/22/performance-with-scala-arrays-and-lists/#comment-196 David Illsley Sat, 23 Jun 2007 07:02:54 +0000 http://204.14.242.104/?p=611#comment-196 <p>Sorry, re-read the intro. Shouldn't try to think sbout functional programming before my first coffee of the day,</p> Sorry, re-read the intro. Shouldn’t try to think sbout functional programming before my first coffee of the day,

]]> By: David Illsley http://blog.semergence.com/2007/06/22/performance-with-scala-arrays-and-lists/#comment-198 David Illsley Sat, 23 Jun 2007 06:57:27 +0000 http://204.14.242.104/?p=611#comment-198 <p>I'm not a Scala guru, but have been looking at it in the last few weeks and I seemed to remember a ':::' (triple colon) operator for concatenating lists together. A quick google later and I'm at [1] which seems to suggest you can:</p> <p>scala> List(-1,-2, 1,2,3) ::: List(99, 33, -1, -2, 3) line30: scala.List[scala.Int] = List(-1,-2,1,2,3,99,33,-1,-2,3) </p> <p>Given that that's built-in, I expect there's a pretty good chance it'll be faster.</p> <p>[1] http://blog.lostlake.org/index.php?/archives/41-Scala-Idioms,-Step-1,-Lists-and-Maps.html</p> I’m not a Scala guru, but have been looking at it in the last few weeks and I seemed to remember a ‘:::’ (triple colon) operator for concatenating lists together. A quick google later and I’m at [1] which seems to suggest you can:

scala> List(-1,-2, 1,2,3) ::: List(99, 33, -1, -2, 3)
line30: scala.List[scala.Int] = List(-1,-2,1,2,3,99,33,-1,-2,3)

Given that that’s built-in, I expect there’s a pretty good chance it’ll be faster.

[1] http://blog.lostlake.org/index.php?/archives/41-Scala-Idioms,-Step-1,-Lists-and-Maps.html

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