Object prototype being included in array [closed]

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I'm working on a function that pulls the lat/lng from an MVCArray of markers. The function is below. However, each object in the mapData array contains the prototype of the native object, along with lat/lng. I have played around with hasOwnProperty, but without much luck. Am I doing something obviously wrong here?

    function prepareMarkers() {
    var mapData = [];

    // All we need from our markers list is the co开发者_开发技巧ordinates of the marker and title if it has one
    markers.forEach(function(elem, index) {
        mapData.push({
            lat: elem.getPosition().lat(),
            lng: elem.getPosition().lng()
        });
    });

    return mapData;
}

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You are putting native objects into the mapData array. That's what this is. It's an object.

    {
        lat: elem.getPosition().lat(),
        lng: elem.getPosition().lng()
    }

So, it's working exactly as it should. Since they are objects, they should have the methods from the prototype of the native object. Is there a particular problem you are trying to solve here? Everything you've described so far sounds correct.

In your array, you can just access things like this:

var latitude = mapData[0].lat;
var longitude = mapData[0].lng;