Javascript Arrays created with Object.create - not real Arrays?

Question

It looks like Arrays created with Object.create walk like Arrays and quack like Arrays, but are still not real arrays. At least with v8 / node.js.

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Answer 1

No, you cannot. Object.create is all about prototypes, but both [] and Object.create(Array.prototype) inherit from the same prototype object.

What you call "desired Object.prototype.toString behaviour" is the internal [[Class]] of the object, which is impossible to set up with Object.create. Creating "true arrays" (with an Array class and special array behaviour - indexed properties, .length) is only possible by using array literals or calling the Array constructor.

Answer 2

The short answer is no. This article explains it all in some detail.