Private Variables

    // es6-object methods
    // New ways of declaring methods for objects
    // getters and setters for object properties
    let log = console.log;
    let x = 7;
    
    let obj = {
    	_prop1: 1979,
    	get prop1( ) {
    	      return this._prop1;	// get returns another property
    	},
    	set prop1(_val) {
    	      this._prop1 = _val;	// 
    	},
    	prop2: 'Alien',
    	x,					        // a new variable can also be declared as follows
    	prop3( ) {				    // function declaration can be abbreviated to just its name
          	      log('called prop3');
    	}
    };
    
    log(obj.x);
    log(obj.prop1);					
    obj.prop1 = 1980 ;  or obj.prop1(1980);		
    log(obj.prop1);	
    // log(obj._prop1); //_prop1 is still accessible
    
    // private.js
    // create private variables in JS with functions
    // IIFE – immediately invoked function expression
    let obj = (function ( ) {
    	let _prop1 = 'Starman';		// this is a private variable: console.log(_prop1); will return undefined
    	return {
     	     prop2: 1981,
    	     get prop1 ( ) {
    		return _prop;
    	     } 
    	    set prop1(_val) {
    		_prop1 = _val;
    	     }
    	}
    }) ( );
    
    for(let prop in obj){
    	console.log(prop);		// this will return prop1, and prop2, the properties of the returned object
    }