localStorage vs. Objects

JavaScript performance comparison

Revision 26 of this test case created by Rod Knowlton

Info

Tests the difference between reading from localStorage as compared to reading data from an object.

Preparation code

<script>
  localStorage.setItem("foo", "body { background: blue; margin: 10px; padding: 10px; color: black; text-decoration: none; }");
 
  var FOO = {
   foo: "body { background: blue; margin: 10px; padding: 10px; color: black; text-decoration: none; }"
  };
 
  var value;

 var memoStorage = {
     cache: {},
     getItem: function(k) {
                    if(! this.cache[k]) {
                         this.cache[k] = localStorage.getItem(k);
                      }
                     return this.cache[k]
                          }
                   };
</script>

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Testing in unknown unknown
Test Ops/sec
Reading from an object
value = FOO.foo;
pending…
Reading from localStorage getItem
value = localStorage.getItem('foo');
pending…
Reading from localStorage index
value = localStorage['foo'];
pending…
Reading from localStorage property
value = localStorage.foo
pending…
Memoized localStorage
value = memoStorage.getItem('foo')
pending…

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Revisions

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