Javascript's 'call' re-implemented

gistfile1.txt

var call = function(fn, context) {
  var args = Array.prototype.slice.call(arguments, 2).join(‘,’),
    result;

  context.fn = fn;
  result = eval(“context.fn(“+ args +”)”);
  delete this.fn;

  return result;
};

Line 7: delete context.fn;

Function.prototype.call = function () {
  var args = [].slice.apply(arguments, [1]);
  return this.apply(arguments[0], args);
};