BUILT-IN MATHEMATICA SYMBOL
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 
.
- 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:
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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]= |  |
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