ie javascript for in loop vs chrome for in loop

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IE8 for…in enumerator 3 answers

How do I check if an object has a property in JavaScript? 22 answers

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using IE11 and looks ok to me

if you want more control use Array.prototype.forEach method.It accepts a callback which have three parameters.They are element,their index and the array itself.Try

var arr=["test",'ball'];arr.forEach(function(element,index){
   console.log(index);
});

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Use the hasOwnProperty method.

Example:

var arr = ["test"];
for (var e in arr) {
    if (arr.hasOwnProperty(e)) {
        console.log(e);
    }
}

Good explanation on why this is necessary: https://stackoverflow.com/a/12017703/1387396

Details on the hasOwnProperty method and its use in for .. in loops: Object.prototype.hasOwnProperty() - JavaScript | MDN

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