Swift Collections: Array, Set, Dictionary
Swift's three collections are different access patterns, not just different APIs. Arrays keep order, Sets enforce uniqueness, and Dictionaries map keys to values. Picking an Array for uniqueness checks turns membership from O(1) into O(n) scans.
Swift's standard library offers three core collections that solve fundamentally different data organization problems, not merely syntax variations. Arrays preserve insertion order and allow duplicates, Sets model mathematical uniqueness with hash-based membership tests, and Dictionaries provide key-based lookup tables. You reach for them when sequence, uniqueness, or mapping dominate your access patterns.
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