Swift version: 5.1
Swift 1.2 was an interim release that fixed some early confusions and annoyances in the language. Its changes weren't big, but they did help clean up and clarify Swift, and helped tide us all over until the release of Swift 2.
The important changes are:
if/letrather than create a so-called "pyramid of doom" with nested statements.
as?to mark forced downcasting and optional downcasting respectively.
Setdata type was introduced to handle arrays where each value can appear only once.
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Available from iOS 7.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.