Preparation code

<script>
  var toString = {}.toString;
  
  function typeString (v) {
      return v == null ? String(v) : toString.call(v).slice(8, -1);
  }
  
  function toType(obj) {
    return obj == null ? String(obj) : ({}).toString.call(obj).match(/\s([a-z|A-Z]+)/)[1]
  }
  
</script>

Test runner

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typeString(null);
typeString(undefined);
typeString({});
typeString("");
typeString(2);
 

toType(null);
toType(undefined);
toType({});
toType("");
toType(2);
 

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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 on 9th August 2011
• Revision 2: published on 3rd July 2012
• Revision 3: published on 3rd July 2012

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