Dysfunctional option pattern in Go

dysfunc.go

package src

import (
	"testing"
)

// Apply functional options pattern
type config struct {
	// Required
	foo, bar string

	// Optional
	fizz, buzz int
}

type option func(*config)

func WithFizz(fizz int) option {
	return func(c *config) {
		c.fizz = fizz
	}
}

func WithBuzz(buzz int) option {
	return func(c *config) {
		c.buzz = buzz
	}
}

func NewConfig(foo, bar string, opts ...option) *config {
	c := &config{foo: foo, bar: bar}
	for _, opt := range opts {
		opt(c)
	}
	return c
}

// Benchmark the functional options pattern
func BenchmarkNewConfig(b *testing.B) {
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		NewConfig("foo", "bar", WithFizz(1), WithBuzz(2))
	}
}

// Dysfunctional options pattern
type configDys struct {
	// Required
	foo, bar string

	// Optional
	fizz, buzz int
}

func NewConfigDys(foo, bar string) *configDys {
	return &configDys{foo: foo, bar: bar}
}

func (c *configDys) WithFizz(fizz int) *configDys {
	c.fizz = fizz
	return c
}

func (c *configDys) WithBuzz(buzz int) *configDys {
	c.buzz = buzz
	return c
}

// Benchmark the dysfunctional options pattern
func BenchmarkNewConfigDys(b *testing.B) {
	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		NewConfigDys("foo", "bar").WithFizz(1).WithBuzz(2)
	}
}

Here's the result (ran on a macbook air 15 inch, 16-256 config)

goos: darwin
goarch: arm64
pkg: foo
BenchmarkNewConfig-8            54789004                22.22 ns/op        48 B/op           1 allocs/op
BenchmarkNewConfigDys-8         1000000000               0.2913 ns/op       0 B/op           0 allocs/op
PASS
ok      foo     2.545s

My analog test with result:

go test -bench=. -benchtime=100s
goos: linux
goarch: amd64
pkg: internal/testutil/project
cpu: Intel(R) Core(TM) i7-8565U CPU @ 1.80GHz
BenchmarkFuncOptions-8 36885484 3613 ns/op 336 B/op 2 allocs/op
BenchmarkDisfuncOptions-8 44132131 2549 ns/op 344 B/op 3 allocs/op
PASS
ok internal/testutil/project 345.614s