golang function options

main.go

package main

import (
	"fmt"
)

func main() {
	c := Call("wuriyanto", aOptions("self"), bOptions("taught coder"), cOptions(true))
	fmt.Println(c)
}

type Option struct {
	f func(*options)
}

type options struct {
	x string
	a string
	b string
	c bool
}

func aOptions(a string) Option {
	return Option{func(o *options) {
		o.a = a
	}}
}

func bOptions(b string) Option {
	return Option{func(o *options) {
		o.b = b
	}}
}

func cOptions(c bool) Option {
	return Option{func(o *options) {
		o.c = c
	}}
}

func Call(z string, opts ...Option) string {
	o := &options{
		x: "wuriyanto",
	}
	
	for _, option := range opts {
		option.f(o)
	}
	
	return fmt.Sprintf("x = %s\na = %s\nb = %s\nc = %t", o.x, o.a, o.b, o.c)
}