Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {
        func: function() {}  
    };
    
    
    
  };
</script>

Test runner

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console.log( obj.func instanceof Function ); // solution A

console.log( typeof obj.func ==  'function' ); // solution B

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by rlemon on 2nd February 2012
• Revision 2: published on 9th March 2012
• Revision 3: published on 13th March 2012
• Revision 4: published on 13th March 2012

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