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Swift Functional Programming - Second Edition by Dr. Fatih Nayebi

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Elements

It would be great to be able to generate an array from BSTelements. This can be done as follows:

var elements: [Element] {     switch self {     case .leaf:         return []     case .node(let lhs, let element, let rhs):         return lhs.elements + [element] + rhs.elements     } } 

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