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  • $\begingroup$ Ok, since you posted this, I am liberated from doing that (I gave it in comments to the question), and can happily upvote : +1. $\endgroup$ Commented Dec 18, 2012 at 21:03
  • $\begingroup$ +1, a variation: FoldList[Flatten@{##} &, {First@list}, Rest@list]? or FoldList[Sequence @@@ {##} &, {First@list}, Rest@list]? $\endgroup$ Commented Dec 18, 2012 at 21:06
  • $\begingroup$ @kguler I'd migrate list outside of FoldList, but I hate writing more than I have too. $\endgroup$ Commented Dec 18, 2012 at 21:15
  • $\begingroup$ @LeonidShifrin teach me to look at the comments before I post something ... Speed wise, though, is Join or Append faster. What about kguler's alternatives? $\endgroup$ Commented Dec 18, 2012 at 21:16
  • $\begingroup$ I think @kguler's use of ReplaceList is very elegant. For generic lists, should be quite fast. For packed arrays, Join and Append should be faster, since ReplaceList can not make use of those and will likely unpack. $\endgroup$ Commented Dec 18, 2012 at 21:20