This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.

# SplitBy

 SplitBy[list, f]splits list into sublists consisting of runs of successive elements that give the same value when f is applied. SplitBy[list, {f1, f2, ...}]recursively splits list into sublists by testing elements successively with each of the fi.
• SplitBy[list, ...] splits but does not rearrange list.
• SplitBy performs comparisons only on adjacent pairs of elements.
• SplitBy[list] is equivalent to SplitBy[list, Identity], which is also equivalent to Split[list].
• SplitBy[list, {f1, f2}] is equivalent to Map[SplitBy[#, f2]&, SplitBy[list, f1]].
Split into runs of numbers with identical integer part:
Split into runs of triples with identical first component:
Split first by their first component and then by their second:
Split dates into runs with identical year:
Split into runs of numbers with identical integer part:
 Out[1]=

Split into runs of triples with identical first component:
 Out[1]=
Split first by their first component and then by their second:
 Out[2]=

Split dates into runs with identical year:
 Out[1]=
 Out[2]=
New in 7