JSFiddle - React, Tailwind, and code Playground

JavaScript

function sayHiBye(firstName, lastName) {

  /* Ниже две вспомогательные функции.
  В них заданы способы приветствия и прощания */
  
  function getFirstName() {
    return firstName;
  }
  
  function getRespect(lName) {
  
  	function addMr() {
    	return "Mr, " + lName;
    }
  
  	mrLastName = addMr();
    return mrLastName;
  }

  console.log( "Hello, " + getFirstName());
  console.log( "Bye, " + getRespect(lastName) );

}

sayHiBye("John", "Petrov")