Question

It seems it’s always empty :

var idStruttura=2;
var arrayMarkers=new Array();

arrayMarkers["sede_"+idStruttura] = "ciao";
alert(arrayMarkers.length);

Prints always 0. Why? And how can I fix it?

Answer 1

An array is not an associative array, however the array object is an object, and all objects are associative arrays. If you use a string as key when assigning items to the array, you are not using it as an array, you are using it as an object.

The length property of the array returns how many items you have stored in the array. If you also use the array object as an associative array, that won’t affect how you use the array as an array.