Symbols as Semi-Private Property Keys

advantages of making object properties private, its drawbacks and use cases

Creating truly private properties and operations is feasible, but it’s not an obvious task in JavaScript. If it was as obvious as in Java, blog posts like this, this, this, this, and many more wouldn’t have emerged.

Check out Exercise 2 to find out more about how to simulate private variables in JavaScript to decide whether it’s worth for you.

Even though Symbols do not make attributes private, they can be used as a notation for private properties. You can use symbols to separate the enumeration of public and private properties, and the notation also makes it clear.

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Function Scope, Block Scope, Constants

Arrow Functions

Default Arguments

Classes

Destructuring

Spread Operator and Rest Parameters

Objects in ES6

Tail Call Optimization and Other Function Features in ES6

Symbols

The for-of loop

String and Template Literals

Sets, Maps, and their Weak Versions

Iterators and Generators in Depth

ES6 Promises

Configuring ES6 with Webpack

The Reflect API

Proxies in Practice

Math and Number Extensions

ES2016

ES2017

Your Final Exam: ES6 Job Interview Questions

Bonus chapter: Your learning plan

Symbols as Semi-Private Property Keys