golang-fluent-pattern-constructor-example.go

package main

import "fmt"

func main() {
	myEmail := &Email{}
	myEmail.withFrom("sender").
		withTo("recipient").
		withSubject("hello").
		withBody("howdy?")

	fmt.Println("my email: ", *myEmail)
}

type Email struct {
	from    string
	to      string
	subject string
	body    string
}

func (e *Email) withFrom(fr string) *Email {
	e.from = fr
	return e
}

func (e *Email) withTo(to string) *Email {
	e.to = to
	return e
}

func (e *Email) withSubject(s string) *Email {
	e.subject = s
	return e
}

func (e *Email) withBody(b string) *Email {
	e.body = b
	return e
}