title: 2d javascript array using json notation (help me clear up the confusion)
body: <p>I am writing Tetris in JavaScript as practice, and i am somewhat confused by the array notation that i am using. 
  Here's the array that i have that stores all my pieces. </p>
  
  <pre><code>var pieces = [[[1,1],
                 [1,1]],
  
                [[1,0],
                 [1,0],
                 [1,1]],
  
                [[0,1],
                 [0,1],
                 [1,1]],
  
  
                [[0,1,0],
                 [1,1,1]],
  
                [[1,0],
                 [1,1],
                 [0,1]],
  
                [[0,1],
                 [1,1],
                 [1,0]]];
  </code></pre>
  
  <p>What is this notation called? How is this difference from just saying "new array()"?</p>
  
  <p>Thank you!</p>