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
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