/**
 * Read FAQs section on the left for more information on how to use the editor
**/
Function.prototype.customBind = function (context={},...args) {
  if(typeof this !== 'function') {
    throw new Error(this+ "It's not callable");
  }
  context.fn = this;
  return function(...newArgs) {
    return context.fn(...args,...newArgs);
  }
}

const module = {
  x: 42,
  getX: function() {
    return this.x;
  }
}

const unboundGetX = module.getX;
console.print(unboundGetX()); // The function gets invoked at the global scope
// expected output: undefined

const boundGetX = unboundGetX.customBind(module);
console.print(boundGetX());
// expected output: 42