benchmark-null-and-pointer.go

func BenchmarkPointer(b *testing.B) {
	var (
		t0 null.String
		t1 null.String
		t2 null.String
		t3 null.String
		t4 null.String
		t5 null.String
		t6 null.String
		t7 null.String
		t8 null.String
		t9 null.String

		p0 = &t0.String
		p1 = &t1.String
		p2 = &t2.String
		p3 = &t3.String
		p4 = &t4.String
		p5 = &t5.String
		p6 = &t6.String
		p7 = &t7.String
		p8 = &t8.String
		p9 = &t9.String
	)

	if rand.Int() > 10 {
		t0 = null.StringFrom("poipoi")
		p0 = &t0.String
	}
	if rand.Int() > 10 {
		t1 = null.StringFrom("poipoi")
		p1 = &t1.String
	}
	if rand.Int() > 10 {
		t2 = null.StringFrom("poipoi")
		p2 = &t0.String
	}
	if rand.Int() > 10 {
		t3 = null.StringFrom("poipoi")
		p3 = &t3.String
	}
	if rand.Int() > 10 {
		t4 = null.StringFrom("poipoi")
		p4 = &t4.String
	}
	if rand.Int() > 10 {
		t5 = null.StringFrom("poipoi")
		p5 = &t5.String
	}
	if rand.Int() > 10 {
		t6 = null.StringFrom("poipoi")
		p6 = &t6.String
	}
	if rand.Int() > 10 {
		t7 = null.StringFrom("poipoi")
		p7 = &t7.String
	}
	if rand.Int() > 10 {
		t8 = null.StringFrom("poipoi")
		p8 = &t8.String
	}
	if rand.Int() > 10 {
		t9 = null.StringFrom("poipoi")
		p9 = &t9.String
	}

	var output string

	b.Run("null", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			if t0.Valid {
				output = t0.String
			}
			if t1.Valid {
				output = t1.String
			}
			if t2.Valid {
				output = t2.String
			}
			if t3.Valid {
				output = t3.String
			}
			if t4.Valid {
				output = t4.String
			}
			if t5.Valid {
				output = t5.String
			}
			if t6.Valid {
				output = t6.String
			}
			if t7.Valid {
				output = t7.String
			}
			if t8.Valid {
				output = t8.String
			}
			if t9.Valid {
				output = t9.String
			}
		}
	})

	if rand.Int() > 10 {
		t0 = null.StringFrom("poipoi")
		p0 = &t0.String
	}
	if rand.Int() > 10 {
		t1 = null.StringFrom("poipoi")
		p1 = &t1.String
	}
	if rand.Int() > 10 {
		t2 = null.StringFrom("poipoi")
		p2 = &t0.String
	}
	if rand.Int() > 10 {
		t3 = null.StringFrom("poipoi")
		p3 = &t3.String
	}
	if rand.Int() > 10 {
		t4 = null.StringFrom("poipoi")
		p4 = &t4.String
	}
	if rand.Int() > 10 {
		t5 = null.StringFrom("poipoi")
		p5 = &t5.String
	}
	if rand.Int() > 10 {
		t6 = null.StringFrom("poipoi")
		p6 = &t6.String
	}
	if rand.Int() > 10 {
		t7 = null.StringFrom("poipoi")
		p7 = &t7.String
	}
	if rand.Int() > 10 {
		t8 = null.StringFrom("poipoi")
		p8 = &t8.String
	}
	if rand.Int() > 10 {
		t9 = null.StringFrom("poipoi")
		p9 = &t9.String
	}

	b.Run("pointer", func(b *testing.B) {
		for i := 0; i < b.N; i++ {
			if p0 != nil {
				output = *p0
			}
			if p1 != nil {
				output = *p1
			}
			if p2 != nil {
				output = *p2
			}
			if p3 != nil {
				output = *p3
			}
			if p4 != nil {
				output = *p4
			}
			if p5 != nil {
				output = *p5
			}
			if p6 != nil {
				output = *p6
			}
			if p7 != nil {
				output = *p7
			}
			if p8 != nil {
				output = *p8
			}
			if p9 != nil {
				output = *p9
			}
		}
	})

	b.Log(output)
}

goos: darwin
goarch: arm64
cpu: Apple M2
BenchmarkPointer/null-8         	258927933	         4.507 ns/op	       0 B/op	       0 allocs/op
BenchmarkPointer/pointer-8      	318818846	         3.771 ns/op	       0 B/op	       0 allocs/op