Functional options for friendly APIs

options.go

//http://lubia.cn/2016/05/22/functional-options-for-friendly-apis/
//http://dave.cheney.net/2014/10/17/functional-options-for-friendly-apis
package main

import (
	"fmt"
)

type Options struct {
	Name      string
	Age       int32
	Addesss   string
	IdCard    string
	Cellphone string
}

type Option func(*Options)

func NewOptions(opts ...Option) (opt Options) {
	for _, o := range opts {
		o(&opt)
	}
	return
}

func Name(name string) Option {
	return func(o *Options) {
		o.Name = name
	}
}

func Age(age int32) Option {
	return func(o *Options) {
		o.Age = age
	}
}

func Address(addr string) Option {
	return func(o *Options) {
		o.Addesss = addr
	}
}

func main() {
	var opt Options
	opt = NewOptions(
		Name("xigang"),
		Age(24),
		Address("Beijing"))

	fmt.Printf("%v", opt)
}