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

Converting ArrayBuffer to Base64-encoded String for Multipart Post

To efficiently convert an ArrayBuffer to a base64 string suitable for multipart posts, developers can leverage the following techniques:

Native Implementation

The first approach involves utilizing native functionality:

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 );
}

Non-Native Implementation

If native implementation is not supported or requires speed optimization, consider using non-native methods:

// Refer to external library or gist for non-native implementation

Performance Comparison

Non-native implementations often exhibit higher performance as demonstrated in benchmarks:

• [JS Perf](https://jsperf.com/encoding-xhr-image-data/6)
• [JS Bench](https://jsben.ch/wnaZC)

However, developers should assess the performance and browser compatibility before choosing a particular approach.

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