How to Efficiently Convert an ArrayBuffer to a Base64 String?

Convert an ArrayBuffer to Base64-Encoded Strings

To efficiently transmute an ArrayBuffer into a base64 string for multipart posting, leverage this native code snippet:

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 );
}

While providing an efficient native solution, consider using faster non-native implementations like this one: https://gist.github.com/958841.

Performance comparisons demonstrate a notable speed advantage for non-native methods, as highlighted in benchmarks:

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

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