Swift BasicsLesson 20Free preview

Swift Collections

This lesson is part of Swift · All levels

Summary

This study reviews three main types of data collection structures in Swift: Array, Set, and Dictionary. The entire collection in Swift is pure value types that are safe from multi-thread mutations and optimized using copy-on-write techniques.

Key points

Three primary collection types: Array, Set, and Dictionary
Made mutable with 'var' and immutable with 'let'
The set requires the data type to implement the Hashable protocol
Dictionary returns Optional value when accessed with key because key may not be found

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