Best of Modern JavaScript — Well-Known Symbols

Best of Modern JavaScript — Well-Known Symbols

Since 2015, JavaScript has improved immensely. It’s much more pleasant to use it now than ever. In this article, we’ll look at new OOP features in JavaScript.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at new OOP features in JavaScript.

How to use proto?

To get the prototype of an object, we use Object.getPrototypeOf .

To create an object with a given prototype, we can use Object.create .

Object.setPrototypeOf is deprecate and it prevents optimizations in many browsers.

__proto__ can be used to get and set the prototype of an object.

Enumerability

The for-in loop traverses the string keys of an own and inherited enumerable properties.

Object.keys returns the string keys of an enumerable own properties.

JSON.stringify only stringified enumerable own properties and string keys.

In ES6, Object.assign only copies enumerable own string and symbol properties.

There’re many non-enumerable properties in a JavaScript object.

All prototype properties of built-in classes are non-enumerable

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