What lazy stored properties is and when it is useful?
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How to convert nsmutablearray to swift array in swift?
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What is the significance of “?” In swift?
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The following code snippet results in a compile time error: struct IntStack { var items = [Int]() func add(x: Int) { items.append(x) // Compile time error here. } } Explain why a compile time error occurs. How can you fix it?
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