The removeAll(where:) method
Changes in new versions / Swift 4.2
The CaseIterable protocol
random(in:) instead of arc4random
Hashing with hash(into:)
The toggle() method
The #warning and #error directives
The removeAll(where:) method
The allSatisfy method
The @dynamicMemberLookup attribute
The removeAll(where:) method
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