[javascript] Private properties in JavaScript ES6 classes

Yes - you can create encapsulated property, but it's not been done with access modifiers (public|private) at least not with ES6.

Here is a simple example how it can be done with ES6:

1 Create class using class word

2 Inside it's constructor declare block-scoped variable using let OR const reserved words -> since they are block-scope they cannot be accessed from outside (encapsulated)

3 To allow some access control (setters|getters) to those variables you can declare instance method inside it's constructor using: this.methodName=function(){} syntax

"use strict";
    class Something{
        constructor(){
            //private property
            let property="test";
            //private final (immutable) property
            const property2="test2";
            //public getter
            this.getProperty2=function(){
                return property2;
            }
            //public getter
            this.getProperty=function(){
                return property;
            }
            //public setter
            this.setProperty=function(prop){
                property=prop;
            }
        }
    }

Now lets check it:

var s=new Something();
    console.log(typeof s.property);//undefined 
    s.setProperty("another");//set to encapsulated `property`
    console.log(s.getProperty());//get encapsulated `property` value
    console.log(s.getProperty2());//get encapsulated immutable `property2` value

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