How to Efficiently Convert an ArrayBuffer to a Base64 String for Multipart Post Requests?

Native Conversion of ArrayBuffer to Base64-Encoded String for Multipart Post

Question: How can I convert an ArrayBuffer to a base64-encoded string for use in multipart posts, with an emphasis on native efficiency?

Answer: Implement the following function:

function _arrayBufferToBase64(buffer) {
  var binary = '';
  var bytes = new Uint8Array(buffer);
  var len = bytes.byteLength;
  for (var i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i]);
  }
  return window.btoa(binary);
}

However, note that non-native implementations tend to offer superior speed. For such a use case, consider the following alternative: https://gist.github.com/958841

Benchmarks:

• http://jsperf.com/encoding-xhr-image-data/6
• https://jsben.ch/wnaZC

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