Medium - How A Printer From The 80’s Can Improve Your Programming - 1

email

// COMMON CODE

const DEFAULT_SENDER = '[email protected]';
const Email = require('some-email-service');


// EXAMPLE 1

let emailOne = (person, subject, body) => {
  let email = new Email();
  email.from = DEFAULT_SENDER;
  email.to = person.email;
  email.subject = subject;
  email.body = body;
  email.send();
}

let emailMany = (people, subject, body) => {
  people.forEach((person) => {
    let email = new Email();
    email.from = DEFAULT_SENDER;
    email.to = person.email;
    email.subject = subject;
    email.body = body;
    email.send();
  });
}

let sendEmails = (peopleOrPerson, subject, body) => {
  if(Array.isArray(peopleOrPerson)){
    emailMany(peopleOrPerson, subject, body);
  }else{
    emailOne(peopleOrPerson, subject, body);
  }
}


// EXAMPLE 2

let sendEmails = (tos, subject, body) => {
  if(!Array.isArray(tos)) tos = [tos];
  tos.forEach((to) => {
    email = new Email();
    email.from = DEFAULT_SENDER;
    email.to = to;
    email.subject = subject;
    email.body = body;
    email.send();
  });
}


// USAGE

sendEmails(people.map(x => x.email), "You're Invited", "Event: 2pm on Saturday");
sendEmails(people.map(x => x.email), "Don't Forget", "Event: 2pm on Saturday");
sendEmails(people.pop(), "You're The Guest of Honor", "Event: 2pm on Saturday");