Events exercise + solution

Author: Ian-Read

events/exercise/emailer.js

@@ -0,0 +1,7 @@
+module.exports = class Emailer {
+
+    send (to, body) {
+        console.log(`Sending email to ${to} with body '${body}'`)
+    }
+
+}

events/exercise/solution.js

@@ -0,0 +1,15 @@
+
+const Emailer = require('./emailer')
+const { EventEmitter } = require('events')
+
+const emailer = new Emailer()
+
+const userEvents = new EventEmitter()
+
+const sendWelcomeEmail = function sendWelcomeEmail(emailAddress) {
+    emailer.send(emailAddress, `Welcome to our app!`)
+}
+
+userEvents.on('newUser', sendWelcomeEmail)
+
+userEvents.emit('newUser', 'example@example.com')

events/index.md

@@ -62,3 +62,10 @@ require('events)
 
 Main concept = listeners listen for events, that are emitted from emitters.
 
+## Exercise
+
+Image we are building a SaaS that does a number of things when a user creates an account.   functionality that sends emails "confirmation" to a user when they create an account.
+
+There is a mock emailer class in the folder that has a method `send`, which expects an email address and a message body as the parameters.
+
+Use this to send a welcome email when a `userCreated` event is fired.