Node.js Buffer to ArrayBuffer

buffer.js

// @credit: http://stackoverflow.com/questions/8609289/convert-a-binary-nodejs-buffer-to-javascript-arraybuffer

// From Buffer to ArrayBuffer:

function toArrayBuffer(buffer) {
    var ab = new ArrayBuffer(buffer.length);
    var view = new Uint8Array(ab);
    for (var i = 0; i < buffer.length; ++i) {
        view[i] = buffer[i];
    }
    return ab;
}

// From ArrayBuffer to Buffer:

function toBuffer(ab) {
    var buffer = new Buffer(ab.byteLength);
    var view = new Uint8Array(ab);
    for (var i = 0; i < buffer.length; ++i) {
        buffer[i] = view[i];
    }
    return buffer;
}

I think this could just be:

function toArrayBuffer(buffer) {
   return buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength);
}

function toBuffer(byteArray) {
   return Buffer.from(byteArray);
}

Or is there something I don't know?

The original gist is from 2014 when buffers weren't instances of Uint8Array and Buffer.from wasn't available. There's better methods available now like the one you suggested.

Ah I see. 😄
Anyway, I guess this is still useful if someone else finds this gist via Google.