LazySquares.swift

//
//  LazySquares.swift
//  SwiftBook
//
//  Created by William Davenport on 12/10/15.
//  Copyright © 2015 William Davenport. All rights reserved.
//

import Foundation

class SquareContainer {
    
    let maximum: Int
    lazy var squares: [Int] = (1...self.maximum).map { n in
        print(n)
        return n * n
    }
    
    init(withMaximum maximum: Int) {
        self.maximum = maximum
    }
    
    
}

let squareContainer = SquareContainer(withMaximum: 100)
print("squareContainer.squares not yet calculated")
print(squareContainer.squares)
print("squareContainer.squares now calculated")