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Message: [QUOTE="Sander Land, post: 4525546"] Is that really so much faster? Worth breaking on empty arrays? Just had to test if there was any performance difference, results: user system total real inject(0) 20.320000 5.430000 25.750000 ( 34.486938) inject 20.450000 5.350000 25.800000 ( 30.152165) inject &:+ 37.860000 5.690000 43.550000 ( 45.670349) each 11.130000 3.460000 14.590000 ( 15.042142) C 0.020000 0.000000 0.020000 ( 0.019815) so inject(0) vs inject doesn't really matter. code: [URL]http://pastie.caboo.se/11534[/URL] (and yes i know the C code doesn't handle bignums) [USER=4628]@robert[/USER]: you mean the thread "for performance, write in C" ? ;) [/QUOTE]