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Javascript: Mixing Arrays and Objects

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Really what we mean here is that you can have an array of objects, not just simple strings or numbers. And you can reference data in those objects with key:value pairs. Here are several examples of mixing Arrays and Objects together.

//create an array of movies that has the title, the imdb rating and whether or not you have watched it

//v1.0

var movies = [
  {title: "12 Angry Men",
   rating: 4.5,
   status: true},
  {title: "101 Dalmations",
   rating: 3,
   status: true},
  {title: "Avengers 4",
   rating: 5,
   status: false},
]

function movieStatus(theMovie) {
  theMovie.forEach(function (movie){

    if (movie.status === true){
      console.log("You have seen " + "\"" + movie.title + "\"" + " - " + movie.rating + " stars");
    }else{
      console.log("You have not seen " + "\"" + movie.title + "\"" + " - " + movie.rating + " stars");
    };

  })
}

//v.20 - refactored for DRY

var movies = [
  {title: "12 Angry Men",
   rating: 4.5,
   status: true},
  {title: "101 Dalmations",
   rating: 3,
   status: true},
  {title: "Avengers 4",
   rating: 5,
   status: false},
]

function movieStatus(theMovie) {
  theMovie.forEach(function (movie){
    var theRest = "\"" + movie.title + "\"" + " - " + movie.rating + " stars";

    if (movie.status === true){
      console.log("You have seen " + theRest);
    }else{
      console.log("You have not seen " + theRest);
    };

  })
}


//v3.0 - an alternate method
var movies = [
  {title: "12 Angry Men",
   rating: 4.5,
   status: true},
  {title: "101 Dalmations",
   rating: 3,
   status: true},
  {title: "Avengers 4",
   rating: 5,
   status: false},
]

function buildString(movie){
  var result = "You have ";
  if(movie.status){
    result += "watched ";
  } else {
    result += "not seen ";
  }
  result += "\"" + movie.title + "\" - " + movie.rating + " stars";
  return result
}

movies.forEach(function(movie){
  console.log(buildString(movie))
});

And here is version 4, which I did later, and I actually think this is the best:

// the array that we are working with
var movieData = [
  {
    Title: "12 Angry Men",
    Rating: 5,
    hasWatched: true
  },
  {
    Title: "Metropolis",
    Rating: 2,
    hasWatched: false
  },
  {
    Title: "The 3rd Man",
    Rating: 3,
    hasWatched: false
  }
];


//creating a function that loops over the array and prints a string for each item in the array
function printMovieData() {
  movieData.forEach(function(movie) {
    if (movie.hasWatched === true) {
      var watchStatus = " have seen ";
    } else {
      var watchStatus = " have not seen ";
    }
    console.log(
      "You" + watchStatus + movie.Title + " - " + movie.Rating + " stars"
    );
  });
}

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