僅做記錄 /*Functional Options函數選項模式（簡稱FOP模式）既保持了兼容性，而且每增加1個新屬性只需要1個With函數即可，大大減少了修改代碼的風險 */ package mainimport "fmt"/*Functional Options函數選項模式（簡稱FOP模式）既保持了兼容性，而且每增加1個新屬性只需要1個With函數即可，大大減少了修改代碼的風險 */type Student struct {Name stringAge intSex string }//定義類型函數 type StudentOption func(*Student)//創建帶有age的構造函數 func WithAge(age int) StudentOption {return func(s *Student) {s.Age = age} }func WithSex(sex string) StudentOption {return func(s *Student) {s.Sex = sex} }//創建帶有默認值的構造函數 func NewStudent(name string, options ...StudentOption) *Student {student := &Student{Name: name}for _, o := range options {o(student)}return student }func main() {student := NewStudent("fourier", WithAge(6), WithSex("男"))fmt.Println(student)teacher := NewTeacher("fourier", WithTeacherAge(20), WithGender("男"))fmt.Println(teacher) }type Teacher struct {Name stringAge intGender string }type TeacherOptions func(*Teacher)func WithTeacherAge(age int) TeacherOptions {return func(teacher *Teacher) {teacher.Age = age} }func WithGender(gender string) TeacherOptions {return func(teacher *Teacher) {teacher.Gender = gender} }func NewTeacher(name string, options ...TeacherOptions) *Teacher {teacher := &Teacher{Name: name}for _, option := range options {option(teacher)}return teacher }

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