es6 functions explained...

es6_functions.js

// method shorthand. ES6 version.
{
  initialize() {},
  doSomething() {}
  
}

// replaces (ES5)

{
  initialize: function() {},
  doSomething: function() {}
}

// arrow functions (bind 'this' properly. No more 'self = this' needed.)
(param1, param2) => {}
// replaces anon functions 
function(param1, param2) {}

// because 
() => {}  === function() {}.bind(this)