title: looping through javascript object
body: <p>How do you access properties of a javascript object like the following?
  Please explain each step if possible.</p>
  
  <pre><code>var contacts = [
  {
      "firstName": "Akira",
      "lastName": "Laine",
      "number": "0543236543",
      "likes": ["Pizza", "Coding", "Brownie Points"]
  },
  {
      "firstName": "Harry",
      "lastName": "Potter",
      "number": "0994372684",
      "likes": ["Hogwarts", "Magic", "Hagrid"]
  },
  {
      "firstName": "Sherlock",
      "lastName": "Holmes",
      "number": "0487345643",
      "likes": ["Intriguing Cases", "Violin"]
  },
  {
      "firstName": "Kristian",
      "lastName": "Vos",
      "number": "unknown",
      "likes": ["Javascript", "Gaming", "Foxes"]
    }
   ];
  
  
   function lookUp(firstName, prop){
  
       //code here
  
   }
  </code></pre>
  
  <p>I would like to be able to access the name of a contact. So for example</p>
  
  <pre><code>                      lookUp("Akira", "likes") 
  </code></pre>
  
  <p>should give me the name and the likes. And also 
                             lookUp("Drew", "like") 
  should give me back 
                              "No such contact".</p>
  
  <p>Thanks a lot in advance!</p>