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What's New in Foundation: Parsing JSON in Swift 4
What's New in Foundation: Custom JSON Decoding

iOS 11 Screencasts: What's New in Foundation

2. What's New in Foundation: Key Value Observing (KVO)

Foundation now gives a new way to interact with KVO by way of new keypaths and the addition of observers.

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iOS 11 Screencasts: What's New in Foundation - Part 2: What's New in Foundation: Key Value Observing (KVO)