lizlongnc

The () suffix operator surrounding zero or more comma separated arguments.
The arguments in () passed to the function will be bound to the JS function pseudo parameter - parameters.

If a function is called with too many arguments, the extra arguments are ignored.
If a function is called with too few arguments, the missing values will be undefined.
There is no implicit type checking on the arguments.

There are 4 ways to call a function:
  Function form
    functionObject(arguments)

lizlongnc

If you using a function with an outside object, use this.
The this pseudo parameters contains a reference to the object of invocation.
this allows a method to know what object it is concerned with.
this allows a single function object to service many objects.
this is key to prototypal inheritance.

allows a single function to work on many objects
the way the function knows which object it is working on is by the this binding

this is a bonus parameter.  Its value depends on the calling form.

lizlongnc

// All JS functions receive 2 pseudo parameters - arguments and this.
// The following uses JS built-in pseudo parameter (arguments).
// arguments is an array-like thing that contains all the arguments passed to the function
// if an argument changes, arguments also changes which can sometimes slow things down
// can access arguments.length
// and can use arguments to manipulate values passed to the function

function sum() {
  'use strict';
  var i = 0, total = 0;

lizlongnc

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console