The code: https://play.golang.org/p/DxUj6kBqf8k
The Filter4 function has one more assignment statement than Filter3. But the benchmark result shows Filter4 is faster than Filter3. The result: cpu: Intel(R) Core(TM) i5-4210U CPU @ 1.70GHz BenchmarkFilter3-4 3575656 980.2 ns/op 0 B/op 0 allocs/op BenchmarkFilter4-4 3956533 916.8 ns/op 0 B/op 0 allocs/op -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/4b6112d7-4781-4295-944b-f878abc1f67cn%40googlegroups.com.