Can someone explain the localstorage service to me please?

From the ionic formulas page. I don’t get this bit:

get: function(key, defaultValue) {
  return $window.localStorage[key] || defaultValue;

I know it creates a get() method on $localstorage but I’m having some trouble getting it working and it’s because I don’t understand it.

If I use this


what happens if there is nothing stored? It looks like the method get()s the value from localStorage OR gets the defaultValue.

So if I do this:

get: function(key, defaultValue) {
  return $window.localStorage[key] || 0;

I should get 0 as my default when nothing is stored, yes? Or do I have to do something else?

I’m trying to use this to store the user gender. I initialise it like this:

$scope.usergender = $localstorage.get('storeGender');
 console.log("Usergender on initialise is", $scope.usergender);

and then store it like this:

changeGender = function(){$localstorage.set('storeGender',$scope.usergender)
console.log("Usergender is now", $scope.usergender);

My html looks like this:

<div class="item range range-assertive">
    <i class="icon ion-male"></i> Male
    <input type="range" name="gender" min="0" max="1" ng-model="usergender" onChange="changeGender()">
    Female <i class="icon ion-female"></i>

At the moment all I get in the console is:

  Usergender on initialise is undefined. 

and this remains this way even after I use the range slider to try and change things. I’ve tried using ng-change and get the same thing.