diff --git a/core/misc/states.js b/core/misc/states.js
index b969da7..663176f 100644
--- a/core/misc/states.js
+++ b/core/misc/states.js
@@ -80,6 +80,20 @@
       // The "reference" variable is a comparison function.
       return reference(value);
     },
+   'Array': function (reference, value) {
+     // Make sure value is an array.
+     if (!Array.isArray(value)) {
+       return false;
+     }
+     // We iterate through each value provided in the reference. If all of them
+     // exist in value array, we return true. Otherwise return false.
+     for (var key in reference) {
+       if (reference.hasOwnProperty(key) && value.indexOf(reference[key]) === -1) {
+         return false;
+       }
+     }
+     return true;
+   },
     'Number': function (reference, value) {
       // If "reference" is a number and "value" is a string, then cast reference
       // as a string before applying the strict comparison in compare(). Otherwise
@@ -121,7 +135,7 @@
           state = states.State.sanitize(state);

           // Initialize the value of this state.
-          this.values[selector][state.name] = null;
+          this.values[selector][state.name] = undefined;

           // Monitor state changes of the specified state for this dependee.
           $(selector).on('state:' + state, {selector: selector, state: state}, stateEventHandler);