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+# Current "Best Practice" Conventions
+
+
+- Please use [JS Standard Style](https://standardjs.com/) as a coding style guide.
+- `ES6 class` rather than ES5 to create class.
+- CSS declaration using `csjs-inject`.
+- CSS files: 
+
+  **if** the CSS section of an UI component is too important, CSS declarations should be put in a different file and in a different folder.
+  
+  The folder should be named `styles` and the file should be named with the extension `-styles.css`.
+  
+  e.g: `file-explorer.js` being an UI component `file-explorer-styles.css` is created in the `styles` folder right under `file-explorer.js`
+
+  **if** the CSS section of an UI component is rather limited it is preferable to put it in the corresponding JS file.
+  
+- HTML declaration using `yo-yo`.
+
+- 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), and should *not* by called again from outside the component.
+- `update()` call this function to update the DOM when the state of the component has changed (this function must be called after the initial call to `render()`).
+- for all functions / properties, prefixing by underscore (`_`) means the scope is private, and they should **not** be accessed not changed from outside the component.
+- constructor arguments: There is no fixed rule whether it is preferrable to use multiples arguments or a single option *{}* argument (or both).
+  We recommend: 
+    - use a specific slot for **obligatory** arguments and/or for complex arguments (meaning not boolean, not string, etc...).
+    - put arguments in an option *{}* for non critical and for optionnal arguments.
+    - if a component has more than 4/5 parameters, it is recommended to find a way to group some in one or more *opt* arguments.
+  
+- 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('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 (api, events, opts = {}) {
+    var self = this
+
+    self.event = new EventManager()
+    self.opts = opts
+    self._api = api
+    self._consumedEvents = events
+    self._view = undefined
+    
+    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 view = 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) {
+      self._view = view
+    }
+    return self._view
+  }
+  update () {
+    yo.update(this._view, this.render())
+  }
+  setNickname (name) {
+    this._nickname = name
+  }
+  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('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(
+  { getUserFunds, clearUserFunds }, 
+  { funds: funds.event },
+  {
+    title: 'Dr.',
+    name: 'John',
+    surname: 'Doe',
+    nickname: 'johndoe99'
+  })
+
+var el = usercard.render()
+document.body.appendChild(el)
+setTimeout(function () {
+  userCard.setNickname('new name') 
+  usercard.update()
+}, 5000)
+
+```