ArrayBuffer <-> Buffer interop?

[YurySolovyov]

Any updates on this?
If I remember correctly it had some performance problems, but v8 changed a lot since then.
It could be useful for "mixed" node environments such as node-webkit and atom-shell, where you have browser-side APIs that deals only with ArrayBuffer.

So request is to have symmetrical Buffer.toArrayBuffer() and Buffer.from(ArrayBuffer) API, or some other way to make one from the other.

[chrisdickinson]

The discussion around that is currently going on over here, I do believe!

[feross]

@YuriSolovyov You can convert an ArrayBuffer to a Buffer trivially (with a copy) like this: new Buffer(new Uint8Array(arrayBuffer))

There used to be a buffer.toArrayBuffer() method, but it was removed by @trevnorris because of a memory leak.

[vkurchatkin]

@feross new Buffer(new Uint8Array(arrayBuffer)) is slow: https://github.com/iojs/io.js/blob/v1.x/lib/buffer.js#L91

[trevnorris]

@vkurchatkin correct. it is slow. though the only way to "correctly" do it would be to Externalize the ArrayBuffer then do the memcpy. I'm fine experimenting with it, or entertaining a PR that does the same.