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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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Answer Posted / 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!
}
}
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