Mind yo commas!

gistfile1.js

// This snippet constructs an array of objects...via some server-side templating thing
// Now can you tell me what's wrong with this code?
// 
// ...
//

<script language="javascript">
  

  var nouns = [
  
    {% for noun in nouns['people']: -%}
      { 'noun': '{{ noun.name }}', 'category':'People', 'slug':'{{ noun.slug }}' },
    {% endfor -%}

    {% for noun in nouns['places']: -%}
      { 'noun': '{{ noun.name }}', 'category':'Places', 'slug':'{{ noun.slug }}' },
    {% endfor -%}

    {% for noun in nouns['things']: -%}
      { 'noun': '{{ noun.name }}', 'category':'Things', 'slug':'{{ noun.slug }}' },
    {% endfor -%}
    
  ];
  
</script>

// Take a look at line 21 -- that NASTY LITTLE COMMA

//
// Chrome:
[1,2,3,].length //=> 3

// 
// IE:
[1,2,3,].length           //=> 4
JSON.stringify([1,2,3])   //=> [1,2,3]
JSON.stringify([1,2,3,])  //=> [1,2,3,null]