Extensions

// Lesson 3 - 22.3.20

// Calculating and printing the distance between two points using the Int extension

typealias Point = (x: Int, y: Int)

extension Double {
    func calcDist(p1 : Point, p2 : Point) {
        let x = p2.x - p1.x
        let y = p2.y - p1.y
        print(Double(x * x + y * y).squareRoot())
    }
}

var myNum : Double = 5.3
myNum.calcDist(p1: (3, 4), p2: (11, 10))

// Painting a tree using the String extension

extension String {
    func printWithTree() {
        let totalLen : Int = self.count + 5
        var blankLen : Int = (totalLen - 1) / 2
        var starLen : Int = 1
        let numOfIterations = self.count % 2 == 0 || self.count < 2 ? self.count + 1 : self.count
        var str : String = ""
        for _ in 1...numOfIterations {
            if blankLen > 0 {
                for _ in 1...blankLen + 1 {
                    str.append(" ")
                }
                for _ in 1...starLen {
                    str.append("*")
                }
                str.append("\n")
                blankLen -= 1
                starLen += 2
            }
        }
        str.append(" * \(self) *\n")
        for _ in 0...totalLen {
            str.append("*")
        }
        str.append("\n")
        for _ in 1...3 {
            for _ in 1...(totalLen - 1) / 2 {
                str.append(" ")
            }
            str.append("**\n")
        }
        print(str)
    }
}

var name: String = "Ydsdfsd"
name.printWithTree()