Los diez mandamientos del programador ágil

Keynote presentado en el Reginal ScrumGathering Lima 2016 #rsgpe2016

Transcript

1. LOS DIEZ MANDAMIENTOS del programador ágil
2. YO SOY EMILIO UN PROGRAMADOR ÁGIL programador +17 yrs co-fundador de 10Pines miembro fundador de la comunidad Agiles co-chair de la conferencia ágiles 2012 marido, padre Y cervecero casero
3. I. NO ROBARÁS & PEGARÁS CÓDIGO
4. public List selectPending(List registrations) { List pending = new ArrayList(); for (Registration registration: registrations) { if (!registration.isPaid()) { pending.add(registration); } } return pending; }
5. public List selectPending(List registrations) { registrations.stream().filter(p -> !p.isPaid()) .collect(Collectors.toList()); } def select_pending(registrations) registrations.reject(&:paid?) end
6. class SessionsController < ApplicationController def create @session = Session.new(session_params) if @session.save redirect_to my_sessions_path, notice: 'Session created successfully' else render :new end end end
7. class Program def find_by_author(author) sessions = Session.where(author: author, approved: true) if sessions.empty? # do something else # do something end end end
8. II. NO USARÁS NULL
9. public class AttendeePresenter {
 
 private Attendee attendee;
 
 public AttendeePresenter(Attendee attendee) {
 this.attendee = attendee;
 }
 
 public String phoneNumber() {
 if (attendee.getAddress() != null) { Address address = attendee.getAddress();
 if (address.getPhoneNumber() != null) {
 return address.getPhoneNumber();
 } else {
 return "Phone number is not available";
 }
 }
 return "Address is not available";
 }
 }
10. public class Attendee {
 
 public Attendee(Address address) {
 if (address == null)
 throw new IllegalArgumentException(“…”);
 this.address = address;
 }
 
 public Address getAddress() {
 if (address == null) return new UnknownAddress();
 return address;
 }
 
 public String getPhoneNumber() {
 return Optional.ofNullable(address) .map(Address::getPhoneNumber)
 .orElse("Phone number is not available");
 }
 
 }
11. III. NO USARÁS IF
12. class BankAccount def process a_transaction if a_transaction.type == :purchase # charge transaction fee else # assume refund end end end
13. class BankAccount def process a_transaction a_transaction.process self end def process_purchase a_transaction # charge transaction fee end def process_refund a_transaction # refund transaction fee end end
14. class Purchase < Transaction def process a_payment_method a_payment_method.process_purchase self end end class Refund < Transaction def process a_payment_method a_payment_method.process_refund self end end
15. IV. NO USARÁS MOCKS
16. require 'spec_helper' describe Registration do setup do a_conference = Conference.new("ScrumGathering") a_registration = Registration.new a_ticket_store = double("TicketStore") end it ‘tickets available' do expect(a_ticket_store).to receive(:tickets_available?). with(a_conference).and_return(true) expect(a_ticket_store).to receive(:remove).with(a_conference) a_registration.process(a_ticket_store) expect(a_registration.confirmed?).to eq(true) end it ‘run out of tickets' do expect(a_ticket_store).to receive(:tickets_available?). with(a_conference).and_return(false) a_registration.process(a_ticket_store) expect(a_registration.confirmed?).to eq(false) end end
17. V. no tendrás objetos de dominio acoplados con tus frameworks
18. class Speaker < ActiveRecord::Base devise :omniauthable, :omniauth_providers => [:facebook] def approve_session(session) # do something SessionMailer.approve(speaker: self, session: session).deliver end end
19. VI. NO TOMARÁS A TUS TESTS EN VANO
20. VI. NO TOMARÁS A TUS TESTS EN VANO VII. RECUERDA REFACTORIZAR CADA DÍA
21. VI. NO TOMARÁS A TUS TESTS EN VANO VII. RECUERDA REFACTORIZAR CADA DÍA VII. AMARÁS HACER PAIR PROGRAMMING CON TUS COMPAÑEROS
22. IX. DESAFIARÁS HONRARÁS A LOS GURUS DE /[AGILE|.*]/
23. X. NO HAY PRÁCTICAS GRAVADAS EN PIEDRA
24. ¿PREGUNTAS? comentarios, criticas, cumplidos
25. ¡¡¡GRACIAS!!! email: egutter@10pines.com twitter: @egutter site: 10pines.com blog: blog.10pines.com