JavaScript In Practice: ES6 And Beyond/

...

/

Exercise on Symbols

Exercise on Symbols

The exercises below will give you a deeper understanding of symbol along with the pros and cons of using them.

We'll cover the following...

Exercise 1:

What are the pros and cons of using an underscore prefix for expressing our intention that a field is private? Compare this approach with symbols!

Javascript (babel-node)
let mySquare = {
    _width: 5,
    getWidth() { return this._width; }
}

Solution 1:

Pros:

  • Notation and developer experience is simple, provided that your team spreads this practice

  • It does not result in a hard-to-read code structure, all you need is one more character ...

Cons: