Hi,
I've brushed up old Combinations to performance enhancements.
You can load it like:
ConfigurationOfSciSmalltalk project lastVersion load.
You may as why 3?
The is to compare them and collect some concensous. They are:
BadOldCombinations, NewBetterCombinationsGoodAtRandomAccess, NewBetterCombinationsGoodAtSequentialAccess.
I've named them a little longer but easier to distinguish. Check the class comments of the 3 and you will know the difference.
I'll post a benchmarking code below, so you can see how they differ.
seqWork := [:class| [ (class of: (1to:20) length: 10) asArray ] timeToRun].
t1 := seqWork value: BadOldCombinations.
t2 := seqWork value: NewBetterCombinationsGoodAtRandomAccess.
t3 := seqWork value: NewBetterCombinationsGoodAtSequentialAccess.
randWork := [:class| [ |c| c:= class of: (1to:20) length: 10.
1000 timesRepeat: [c atRandom] ] timeToRun ].
t4 := randWork value: BadOldCombinations.
t5 := randWork value: NewBetterCombinationsGoodAtRandomAccess.
t6 := randWork value: NewBetterCombinationsGoodAtSequentialAccess.
HwaJong Oh
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