### Using Controllers
* Use `Controllers`, which are function declarations that contain public and private methods
* For example:

```javascript
var budgetController = function() {
  // declare private functions here
  var functionOne = function() {

  }

  // declare other variables and data structures

  // in order to return public functions, you must return them in an object!
  // CLOSURES!
  return {
    pubFunctionOne: function() {

    },

    pubFunctionTwo: function() {

    }
  }

}

```

---
### HTML DOM Element Creation
* You can create DOM elements in a string
* For content that needs interpolation or a real value, insert a placeholder: `%example%`
    * To insert a value into this location: `htmlString.replace("%example%", actualValue)`
    * Then re-insert this newly editted string to the DOM element!

---
### JS DOM Element Querying
* Save all queried strings into an object (in case the element needs to be re-queried)
    * `var DOMElements = { btn: ".btn"}`