Why does my function have a value of zero even when met?

Question

Could somebody please explain why when this function is used elsewhere the value is void even when if condition is met.

Here is my code: function getLocation() { if (navigator.geolocation) { navigator.geolocation.getCurrentPosition(function (position) { var lat = position.coords.latitude; var lat = position.coords.latitude;var long = position.coords.longitude; var uCoords = [lat, long]; console.log(uCoords); return uCoords }); } }