Using the $cacheFactory Service
The $cacheFactory service provides a very handy repository for temporarily storing data as key/value pairs. Because $cacheFactory is a service, it is available to multiple controllers and other AngularJS components.
When creating the $cacheFactory service, you can specify an options object that contains the capacity property—for example, {capacity: 5}. By adding this capacity setting, you limit the maximum number of elements in the cache to five. When a new item is added, the oldest item is removed. If no capacity is specified, the cache continues to grow.
Listing 9.4 illustrates a basic example of implementing $cacheFactory in a Module object and then accessing it from two different controllers.
Listing 9.4
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