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Re: Insulating data from code

Thanks, everybody. That was instructive.

For short lists, with Length@Flatten@B < 100 or so,
a version of J. Siehler's code is clearly fastest:

partitionedAz[A_, B_] /; Length@A >= Length@Flatten@B :=
              ReplacePart[B, A, Position[B,_,{-1},Heads->False],

For longer lists, a two-stage version of my code is a little faster:

copyPartishun[A_, B_] /; Length@A >= Length@Flatten@B :=
              Map[A[[#]]&, Block[{i=0},Map[++i&,B,{-1}]] ,{-1}]

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