function.apply

• Apply method is present on Function prototype ,
• It accept "this" (context) as first parameter and rest parameter are its argument in array

function myApply(context, args) {
  if (typeof this !== "function") {
    throw new Error(`not a function`);
  }
  context["callingFunction"] = this;
  let res = context["callingFunction"](args);
  delete context["callingFunction"];
  return res;
}

Function.prototype.myApply = myApply;

function abc(args) {
  console.log(this.a);
  console.log(args);
}

try {
  abc.myApply({ a: 1 }, [1, 2, 3, 4]); // This will give output
} catch (error) {
  console.error("error here", error.message); // Print the error message
}