I renamed sigma to map-sum. While sigma is a cute name, it's kind of
obscure and just another thing to remember. For those of you who
never used the sigma (now map-sum) word, the map-sum word is just a
more efficient version of "map sum" that doesn't construct an
intermediate sequence. Notice how "map sum" triggers a garbage
collection and map-sum doesn't.
Doug
: foo ( seq -- n ) [ sq ] map sum ;
: bar ( seq -- n ) [ sq ] map-sum ;
[ 1000000 iota foo ] time
== Running time ==
0.151428 seconds
== Garbage collection ==
Times are in microseconds.
Nursery Aging Tenured
GC count: 18 0 0
Total GC time: 3925 0 0
Longest GC pause: 3805 0 0
Average GC pause: 218 0 0
Objects copied: 360 0 0
Bytes copied: 30408 0 0
Total GC time: 3925
Cards scanned: 31395
Decks scanned: 71
Card scan time: 3787
Code heap literal scans: 3
[ 1000000 iota bar ] time
== Running time ==
0.028201 seconds
== Garbage collection ==
Times are in microseconds.
Nursery Aging Tenured
GC count: 0 0 0
Total GC time: 0 0 0
Longest GC pause: 0 0 0
Average GC pause: 0 0 0
Objects copied: 0 0 0
Bytes copied: 0 0 0
------------------------------------------------------------------------------
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