Ultimate version of call() in javascript

myOwnCallUltimate.js

/**
 * By checking the passed in context, we add an wrapper to primitive types or
 * reset the this object to global one if null is passed in
 *
 * @param {*} context
 * @returns
 */
Function.prototype.myOwnCallUltimate = function(context) {
  // Object will tranform primitive value into wrapper Object,kind of Java.
  context = context ? Object(context) : window;
  context.fn = this;
  let args = [...arguments].slice(1);
  let result = context.fn(...args);
  delete context.fn;
  return result;
};