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<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
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<body>
</body>
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function A(){}
A.prototype.inheritedProperty = 1
yourobject = new A
console.log("==== With hasOwnProperty:")
for (var key in yourobject) {
   if (yourobject.hasOwnProperty(key)) {
      console.log(key)
   }
}
console.log("==== Without hasOwnProperty:")
for (var key in yourobject) {
   console.log(key)
}
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