Cache and CacheStorage

Question 1

What is CacheStorage?

Answer 1

The CacheStorage interface represents the storage for Cache objects. It provides a master directory of all the named caches that a ServiceWorker, other type of worker or window scope can access (you don’t have to use it with service workers, even though that is the spec that defines it) and maintains a mapping of string names to corresponding Cache objects.

Question 2

What does CacheStorage expose?

Answer 2

CacheStorage.open() and CacheStorage.match().

Question 3

Describe: CacheStorage.open().

Answer 3

Returns a Promise that resolves to the Cache object matching the cacheName (a new cache is created if it doesn’t exist.).

Question 4

What method is used to obtain a Cached instance?

Answer 4

CacheStorage.open().

Question 5

What method is used to check if a given Request is a key in any of the Cache objects that the CacheStorage object tracks?

Answer 5

CacheStorage.match().

Question 6

Describe: CacheStorage.has().

Answer 6

Returns a Promise that resolves to true if a Cache object matching the cacheName exists.

Question 7

Describe: CacheStorage.match().

Answer 7

Checks if a given Request is a key in any of the Cache objects that the CacheStorage object tracks and returns a Promise that resolves to that match.

Question 8

Describe: CacheStorage.delete().

Answer 8

Finds the Cache object matching the cacheName, and if found, deletes the Cache object and returns a Promise that resolves to true. If no Cache object is found, it returns false.

Question 9

Describe: CacheStorage.keys().

Answer 9

Returns a Promise that will resolve with an array containing strings corresponding to all of the named Cache objects tracked by the CacheStorage. Use this method to iterate over a list of all the Cache objects.