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+# Current "Best Practice" Conventions
+
+- `ES6 class` rather than ES5 to create class.
+- CSS declaration using `csjs-inject`.
+- HTML declaration using `yo-yo`.
+- `opt` is an input parameter, it contains the `api` and `event` object.
+- `self._api = opts.api` `opts.api` is an object which contains functions/features that the module needs.
+- `opts.events` contains events manager the module will listen on.
+- A module trigger events using `event` property:
+  `self.event = new EventManager()`. 
+  Events can then be triggered:
+  `self.event.trigger('eventName', [param1, param2])`
+- `self._view` is the HTML view renderered by `yo-yo` in the `render` function.
+- `render()` this function should be called:
+
+  * At the first rendering (make sure that the returned node element is put on the DOM).
+   
+  * When some property has changed in order to update the view.
+- `self.state` contains state properties of the module. These properties are either given from the parent through `òpts` or     computed during the life of the object.
+- `update(state)` allow the parent to easily update some of the state properties.
+- for all functions / properties, prefixing by underscore (`_`) means the scope is private.
+- look them up, discuss them, update them.
+    
+## Module Definition (example)
+```js
+// user-card.js
+var yo = require('yo-yo')
+var csjs = require('csjs-inject')
+var EventManager = require('ethereum-remix').lib.EventManager
+
+var css = csjs`
+  .userCard        {
+    position       : relative;
+    box-sizing     : border-box;
+    display        : flex;
+    flex-direction : column;
+    align-items    : center;
+    border         : 1px solid black;
+    width          : 400px;
+    padding        : 50px;  
+  }
+  .clearFunds { background-color: lightblue; }
+`
+
+class UserCard {
+  constructor (opts = {}) {
+    var self = this
+
+    self.event = new EventManager()
+    self._api = opts.api
+    self._view = undefined
+    self.state = {
+      title: opts.title,
+      name: opts.name,
+      surname: opts.surname,
+      totalSpend: 0,
+      _nickname: opts.nickname,
+      _funds: self._api.getUserFunds()
+    }
+    var events = opts.events
+
+    events.funds.register('fundsChanged', function (amount) {
+      if (amount < self.state._funds) self.state.totalSpend += self.state._funds - amount
+      self.state._funds = amount
+      self.render()
+    })
+    self.event.trigger('eventName', [param1, param2])
+  }
+  render () {
+    var self = this
+    var el = yo`
+      <div class=${css.userCard}>
+        <h1> @${self.state._nickname} </h1>
+        <h2> Welcome, ${self.state.title || ''} ${self.state.name || 'anonymous'} ${self.state.surname} </h2>
+        <ul> <li> User Funds: $${self.state._funds} </li> </ul>
+        <ul> <li> Spent Funds: $${self.state.totalSpend} </li> </ul>
+        <button class=${css.clearFunds} onclick=${e=>self._spendAll.call(self, e)}> spend all funds </button>
+      </div>
+    `
+    if (self._view) yo.update(self._view, el)
+    else self._view = el
+    return self._view
+  }
+  update (state = {}) {
+    var self = this
+    if (!self._view) self._constraint('first initialize view by calling `.render()`')
+    if (state.hasOwnProperty('title')) self.state.title = state.title
+    if (state.hasOwnProperty('name')) self.state.name = state.name
+    if (state.hasOwnProperty('surname')) self.state.surname = state.surname
+    self.render()
+  }
+  getNickname () {
+    var self = this
+    return `@${self.state._nickname}`
+  }
+  getFullName () {
+    var self = this
+    return `${self.state.title} ${self.state.name} ${self.state.surname}`
+  }
+  _spendAll (event) {
+    var self = this
+    self._appAPI.clearUserFunds()
+  }
+  _constraint (msg) { throw new Error(msg) }
+}
+
+module.exports = UserCard
+```
+## Module Usage (example)
+```js
+/*****************************************************************************/
+// 1. SETUP CONTEXT
+var EventManager = require('ethereum-remix').lib.EventManager
+var funds = { event: new EventManager() }
+var userfunds = 15
+function getUserFunds () { return userfunds }
+function clearUserFunds () {
+  var spent = userfunds
+  userfunds = 0
+  console.log(`all funds of ${usercard.getFullName()} were spent.`)
+  funds.event.trigger('fundsChanged', [userfunds])
+  return spent
+}
+setInterval(function () {
+  userfunds++
+  funds.event.trigger('fundsChanged', [userfunds])
+}, 100)
+
+/*****************************************************************************/
+// 2. EXAMPLE USAGE
+var UserCard = require('./user-card')
+
+var usercard = new UserCard({
+  api: { getUserFunds, clearUserFunds },
+  events: { funds: funds.event },
+  title: 'Dr.',
+  name: 'John',
+  surname: 'Doe',
+  nickname: 'johndoe99'
+})
+
+var el = usercard.render()
+document.body.appendChild(el)
+setTimeout(function () { usercard.update({ title: 'Prof.' }) }, 5000)
+```