Go|使用Options模式和建造者模式创建对象实战

type User struct {
	Name string
	Age  int
}
func NewObj(a string, b int) *User {
	user := User{}
	user.Name = a
	user.Age = b
	return &user
}

type User struct {
	Name string
	Age  int
}
type UserOptions struct {
	Name string
	Age  int
}
type UserOpt func(options *UserOptions)
func WithName(name string) UserOpt {
	return func(op *UserOptions) {
		op.Name = name
	}
}
func WithAge(age int) UserOpt {
	return func(op *UserOptions) {
		op.Age = age
	}
}
func NewUser(options ...UserOpt) *User {
	opts := &UserOptions{}
	for _, option := range options {
		option(opts)
	}
	user := &User{
		Name: opts.Name,
		Age:  opts.Age,
	}
	return user
}

func main(){
	user := NewUser(WithName("xiaoxiongYa"),withAge(18))
  println(user.name, user.age)
}

type User struct {
	name string
	age  int
}
type UserBuilder interface {
	SetName(string) UserBuilder
	SetAge(int) UserBuilder
	Build() *User
}
type ConcreteUserBuilder struct {
	user *User
}
func NewConcreteUserBuilder() *ConcreteUserBuilder {
	return &ConcreteUserBuilder{user: &User{}}
}
func (ub *ConcreteUserBuilder) SetName(name string) UserBuilder {
	ub.user.name = name
	return ub
}
func (ub *ConcreteUserBuilder) SetAge(age int) UserBuilder {
	ub.user.age = age
	return ub
}
func (ub *ConcreteUserBuilder) Build(age int) *User {
	return ub.user
}
type Director struct {
	builder UserBuilder
}
func NewDirector(builder UserBuilder) *Director {
	return &Director{builder: builder}
}
func (d *Director) Construct() *User {
	return d.builder.SetName("xiaoxiong").SetAge(18).Build()
}

builder := NewConcreteUserBuilder()
director := NewDirector()
user := director.Construct()