title: How does this functional Javascript example work?
body: <p>I just don't seem to be able to wrap my head around this snippet of code. Could you give me a hint or two on it? </p>
  
  <pre><code>  var filteredList = watchList.map(function(e) {
    return {title: e["Title"], rating: e["imdbRating"]}
    }).filter((e) =&gt; e.rating &gt;= 8);
  </code></pre>
  
  <p>The question: I understand that 'e' is the parameter passed on to the callback of the map method but what are e["Title"] and e["imdbRating"]? We are expected to run this function on an array of objects. I don't understand the syntax, and how this can even invoke something. Extremely perplexed.</p>
  
  <p>I UNDERSTAND WHAT THE CODE DOES BUT HOW COME ARE WE USING THIS <code>title: e["Title"], rating: e["imdbRating"]</code> ???</p>
  
  <p>THIS IS A SAMPLE OF AN ARRAY OF OBJECTS!</p>
  
  <pre><code>var watchList = [
                   {  
                     "Title": "Inception",
                     "Year": "2010",
                     "Rated": "PG-13",
                     "Released": "16 Jul 2010",
                     "Runtime": "148 min",
                     "Genre": "Action, Adventure, Crime",
                     "Director": "Christopher Nolan",
                     "Writer": "Christopher Nolan",
                     "Actors": "Leonardo DiCaprio, Joseph Gordon-Levitt, Ellen Page, Tom Hardy",
                     "Plot": "A thief, who steals corporate secrets through use of dream-sharing technology, is given the inverse task of planting an idea into the mind of a CEO.",
                     "Language": "English, Japanese, French",
                     "Country": "USA, UK",
                     "Awards": "Won 4 Oscars. Another 143 wins &amp; 198 nominations.",
                     "Poster": "http://ia.media-imdb.com/images/M/MV5BMjAxMzY3NjcxNF5BMl5BanBnXkFtZTcwNTI5OTM0Mw@@._V1_SX300.jpg",
                     "Metascore": "74",
                     "imdbRating": "8.8",
                     "imdbVotes": "1,446,708",
                     "imdbID": "tt1375666",
                     "Type": "movie",
                     "Response": "True"
                  },
                  {  
                     "Title": "Interstellar",
                     "Year": "2014",
                     "Rated": "PG-13",
                     "Released": "07 Nov 2014",
                     "Runtime": "169 min",
                     "Genre": "Adventure, Drama, Sci-Fi",
                     "Director": "Christopher Nolan",
                     "Writer": "Jonathan Nolan, Christopher Nolan",
                     "Actors": "Ellen Burstyn, Matthew McConaughey, Mackenzie Foy, John Lithgow",
                     "Plot": "A team of explorers travel through a wormhole in space in an attempt to ensure humanity's survival.",
                     "Language": "English",
                     "Country": "USA, UK",
                     "Awards": "Won 1 Oscar. Another 39 wins &amp; 132 nominations.",
                     "Poster": "http://ia.media-imdb.com/images/M/MV5BMjIxNTU4MzY4MF5BMl5BanBnXkFtZTgwMzM4ODI3MjE@._V1_SX300.jpg",
                     "Metascore": "74",
                     "imdbRating": "8.6",
                     "imdbVotes": "910,366",
                     "imdbID": "tt0816692",
                     "Type": "movie",
                     "Response": "True"
                  },
  </code></pre>