text: let programming = {
      languages: ["JavaScript", "Python", "Ruby"],
      isChallenging: true,
      isRewarding: true,
      difficulty: 8,
      jokes: "http://stackoverflow.com/questions/234075/what-is-your-best-programmer-joke"
  };
  
  //1
  programming.push = "Go";
  
  //2
  programming.difficulty = 7
  
  //3
  delete programming.jokes
  
  //4
  programming.isFun = true
  
  //5
  for (let languages of programming.language){
    console.log(language);
  }
  
  //6
  for (let key in programming){
    console.log(key);
  }
  
  //7
  for (let key in programming){
    console.log(programming[key]);
  }