Creating Objects

    /****************************************
    Creating Objects
    1. Object literals
    2. Object.create() with descriptors
    3. function + new
    4. factory function with closures
    5. JS Class
    ****************************************/
    let log = console.log;
    
    
    // 1. Object literals ////////////////////////////////////
    let obj1 = {
        prop1: 'value1',
        prop2: 'value2',
        prop3: function(){
            console.log(this.prop1);
        }
    }
    log(1, obj1);
    obj1.prop3();
    log('------------------------------')
    
    
    // 2. Object.create ////////////////////////////////////
    let proto = {
        prop3: function(){
            console.log(this.prop1);
        }
    }
    let obj2 = Object.create({}, {    // you could add 'proto' here instead of an empty object
        prop1: {
            writable: true,
            enumerable: true,
            configurable: true,
            value: 'value1'
        },
        prop2: {
            writable: true,
            enumerable: false,
            configurable: true,
            value: 'value2'
        }
    });
    obj2.prop3 = function(){
        console.log(this.prop1);
    }
    log(2, obj2);
    obj2.prop3();
    log('------------------------------')
    
    
    // 3. new + function ////////////////////////////////////
    let Obj = function(v1, v2){
        this.prop1 = v1;
        this.prop2 = v2;
        this.prop3 = function(){
            console.log( this.prop1 );
        }
    }
    let obj3 = new Obj('value1', 'value2');
    log(3, obj3);
    obj3.prop3();
    log('------------------------------')
    
    
    // 4. factory function with closures
    let ObjFF = function(v1, v2){
        let _prop1 = v1;
        let _prop2 = v2;
        return {
            prop1: _prop1,
            prop2: _prop2,
            prop3: function(){
                console.log(_prop1);
            }
        }
    }
    let obj4 = ObjFF('value1', 'value2');
    log(4, obj4);
    obj4.prop3();
    log('------------------------------')
    
    
    // 5. JS Class
    class ObjC{
        constructor(v1, v2){
            this.prop1 = v1;
            this.prop2 = v2;
        }
        prop3() {
            console.log( this.prop1 );
        }
    }
    let obj5 = new ObjC('value1', 'value2');
    log(5, obj5);
    obj5.prop3();