Javascript concatenate multiple buffers

concatBuffers.js

function concatBuffers() {
  var totalSize = 0;
  for( let arg of arguments){
    totalSize += arg.byteLength;
  }

  var tmp = new Uint8Array( totalSize );

  var runningTotalSize = 0;

  for( let arg of arguments){
    tmp.set( new Uint8Array( arg ), runningTotalSize );
    runningTotalSize += arg.byteLength;
  }
  return tmp;
}

concatBuffers(new Uint8Array([0xe6]), new Uint8Array([0xe9]), new Uint8Array([0xa6]))