The following code snippet results in a compile time error: struct IntStack {

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?

Question Posted / iosraj

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The following code snippet results in a compile time error: struct IntStack { var items = [I..

Answer / iosraj

Structures are value types. By default, the properties of a value type cannot be modified from within its instance methods.

However, you can optionally allow such modification to occur by declaring the instance methods as ‘mutating’; e.g.:

struct IntStack {

var items = [Int]()

mutating func add(x: Int) {

items.append(x) // All good!

}

}