Swift Playground
Solve Swift coding puzzles on iPad or Mac, then build your own apps
Swift Playground is Apple's app for learning to code in Swift. Its lessons are interactive puzzles in which you write real Swift code and see the result straight away, and later lessons move on to building small apps of your own.
Free · No login · Desktop · Beginner

About Swift Playground
It teaches commands, loops, functions, variables and types, so it suits complete beginners, including children, who have an iPad or Mac.
It is a free app from the App Store for iPad and Mac. Projects sync between the two through iCloud Drive.
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Tips and discussion
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