append_main_test.go

package main

import "testing"

func BenchmarkTestWithLength(b *testing.B) {
	for i := 0; i < b.N; i++ {
		useAppendWithLength()
	}
}

func BenchmarkTestWithoutLength(b *testing.B) {
	for i := 0; i < b.N; i++ {
		useAppendWithoutLength()
	}
}

func BenchmarkTestNotUseAppend(b *testing.B) {
	for i := 0; i < b.N; i++ {
		notUseAppend()
	}
}

➜  benchtest-arr-go git:(main) ✗ go test -benchmem -bench=.         
goos: darwin
goarch: arm64
pkg: bench-append
BenchmarkTestWithLength-8      	  114627	      9291 ns/op	   81920 B/op	       1 allocs/op
BenchmarkTestWithoutLength-8   	   30699	     41421 ns/op	  386298 B/op	      20 allocs/op
BenchmarkTestNotUseAppend-8    	  287935	      4080 ns/op	   81920 B/op	       1 allocs/op
PASS
ok  	bench-append	4.273s```