Content suggestion: Mention __proto__ in object literal initializers in the "Inheritance and the prototype chain" tutorial

[Josh-Cena]

What is the new suggestion?

This pattern should be mentioned:

const obj = { __proto__: null, a: 1 };

In addition to the Object.create method.

Why is it important or useful?

It's important to note that while Object.prototype.__proto__ is deprecated and non-standard, the __proto__ in literal initializers is standard and probably not any less efficient than Object.create [citation needed]. It's important for MDN to highlight the difference between the two.

Slightly off-topic: the Object.prototype.__proto__ documentation mentioned that:

The __proto__ property can also be used in an object literal definition to set the object [[Prototype]] on creation.

Which can be confusing as well, because __proto__ in object literals is a special construct, not relevant to Object.prototype.__proto__.

I'm open to contributing the two fixes myself, mostly just want to see if anyone has sources on whether __proto__ in initializers are less/more efficient than Object.create.

Other supporting information

• Normative: move __proto__ out of annex b tc39/ecma262#2125
• https://tc39.es/ecma262/#sec-__proto__-property-names-in-object-initializers

[sideshowbarker]

I'm open to contributing the two fixes myself, mostly just want to see if anyone has sources on whether __proto__ in initializers are less/more efficient than Object.create.

Thanks — I’ve assigned this to you, so please do go ahead and open a PR