Editing Lazy initialization (section)

===JavaScript===
This example is in [[JavaScript]].

<syntaxhighlight lang="javascript">
var Fruit = (function() {
  var types = {};
  function Fruit() {};

  // count own properties in object
  function count(obj) {
    return Object.keys(obj).length;
  }

  var _static = {
    getFruit: function(type) {
      if (typeof types[type] == 'undefined') {
        types[type] = new Fruit;
      }
      return types[type];
    },
    printCurrentTypes: function () {
      console.log('Number of instances made: ' + count(types));
      for (var type in types) {
        console.log(type);
      }
    }
  };

  return _static;

})();

Fruit.getFruit('Apple');
Fruit.printCurrentTypes();
Fruit.getFruit('Banana');
Fruit.printCurrentTypes();
Fruit.getFruit('Apple');
Fruit.printCurrentTypes();

</syntaxhighlight>
'''Output'''
<pre>
Number of instances made: 1
Apple

Number of instances made: 2
Apple
Banana

Number of instances made: 2
Apple
Banana
</pre>