Go option funcs pattern

options.go

package main

import "fmt"

type Person struct {
	Name string
	Age  int
}

type personOption func(*Person)

func name(n string) personOption {
	return func(p *Person) {
		p.Name = n
	}
}

func age(a int) personOption {
	return func(p *Person) {
		p.Age = a
	}
}

func NewPerson(opts ...personOption) *Person {
	p := &Person{}
	for _, o := range opts {
		o(p)
	}
	return p
}

func main() {
	d := NewPerson(name("Daniel"), age(27))
	fmt.Printf("%+v\n", d)
}