On Thursday 03 June 2010 16:03:11, Kevin Jardine wrote: > (I've done a basic Google search on this with no results. Apologies if > this has been asked before.) > > I am coding a web application in which the content is a Unicode string > built up over multiple functions and maintained in a State structure. > > I gather that the String module is inefficient and that Data.Text would > be a better choice. > > Is it more efficient to build up a list of Text objects over time and > combine them together with a single Data.Text.concat for the final > output or to run Data.Text.append for each new string so that I am > maintaining a single Text object rather than a list? > > As Data.Text.append requires copying both strings each time, my gut > feeling is that concat would be much more efficient, but Haskell has > surprised me before, so I wanted to check. > > Kevin >
I'd say, use Data.Text.Lazy and its 'fromChunks' function if you produce the string chunkwise. That avoids copying. Perhaps Data.ByteString[.Lazy].UTF8 is an even better choice than Data.Text (depends on what you do). _______________________________________________ Haskell-Cafe mailing list [email protected] http://www.haskell.org/mailman/listinfo/haskell-cafe
