Persistence

Lessons

1. 01 Simple Preference Storage A measurement of how the order in which two screens write to the same key, the repetition of a launch counter, and a default value change the outcome when a small value is stored persistently. 15 min read
2. 02 The Keychain A measurement of how adding the same item a second time changes the status code where secret values are stored, and how an update-or-add operation is order-sensitive. 15 min read
3. 03 The File System A measurement of the repetition and order sensitivity of appending, full replacement, and directory creation where larger data is written to files. 15 min read
4. 04 Local Databases A measurement of how an upsert with a primary key is robust, how inserting with an auto-increment key is sensitive, and how the read order changes the result. 15 min read
5. 05 Object Persistence Frameworks A measurement of how creating and saving objects in a context is repeat-sensitive, how saving with a unique constraint is order-sensitive, and how the constraint changes the class. 15 min read
6. 06 Cloud Sync A measurement of how the arrival order of values decides the result when two devices write the same record, how a per-field set union is robust, and how the server rule changes the class. 15 min read
7. 07 Push Notifications A measurement of how raising the badge locally on a notification from the server is repeat-sensitive and how an absolute badge value in the payload is order-sensitive, and the wrap-up table of the nineteen lessons of the course. 13 min read