return Array.prototype.join.call (view, function() {String.fromCharCode(this)});
But this is crap.
Obviously, since Array::join does not take a callback to transform each element but only the separator by which the elements should be joined.
Instead, to transform every element before joining them you would use Array::map:
return Array.prototype.map.call(view, function(charcode) {
return String.fromCharCode(charcode);
}).join('');
However, there is a much easier solution, as String.fromCharCode does take multiple arguments:
return String.fromCharCode.apply(String, view);