Language reference / Swift
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Start with four numbers: −3, 0, 2 and 5. Keep each number greater than zero. The result contains 2 and 5, in the same order.
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let numbers = [-3, 0, 2, 5]
let positive = numbers.filter { $0 > 0 }Understand optionals
Debug Combine flows
Learn SwiftUI lifecycle
Analyze protocol witnesses
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