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In iOS development practice, it is common to work with various collections from the Swift standard library:

  • Array — an ordered list of elements, accessible by index. Used for storing sequences of data.
  • Set — an unordered collection of unique elements, useful for quick searches and avoiding duplicates.
  • Dictionary — a collection of key-value pairs, where keys are unique. Often used for storing data with quick access via the key.

Example of using Array:

var fruits: [String] = ["Apple", "Banana", "Cherry"]
fruits.append("Date")
print(fruits[0]) // Apple

Collections are also used in UIKit and SwiftUI for displaying lists, for example, UITableViewDataSource works with data arrays.