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  • var index in arr means that index will take on the index on every value in arr. To get the value you need to dereference arr with index. i.e: arr[index] Commented Mar 31, 2013 at 16:29
  • read this answer: JavaScript "For ...in" with Arrays Commented Mar 31, 2013 at 16:32
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    "They are not the properties" Yes, they are properties. "1" in arr; // true Commented Mar 31, 2013 at 16:36

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