CodeChallenge

learning_swift-daniel_seong.playground/Contents.swift

@@ -0,0 +1,59 @@
+//: Playground - noun: a place where people can play
+
+import UIKit
+
+func swap<X> (inout a: X, inout no b: X)
+{
+    (a,b) = (b,a)
+}
+
+var a = "hello"
+var b = "bye"
+swap(&a, &b)
+[a,b]
+
+
+func flexStrings(s1: String = "", _ s2: String = "") -> String {
+    if (s1 + s2 == "")
+    {
+        return "none"
+    }
+    return s1 + s2
+}
+
+var flex = flexStrings("hi", "you")
+var newflex = flexStrings()
+
+func sumAny<T>(a1: T...) -> String
+{
+    let convert = a1.map({(b1: T) -> Int in
+        switch b1
+        {
+        case "" as String, 0 as Int:
+            return -10
+        case let x as String where Int(x) > 0:
+            return Int(x)!
+        case is Int:
+            return b1 as! Int
+        default:
+            return 0
+        }
+        })
+
+        return String(convert.reduce(0, combine: {(c1: Int, c2: Int) -> Int in c1 + c2}))
+}
+
+var test = sumAny ("", 0, "9", 2, "-10")
+
+func countFrom(from: Int, to: Int)
+{
+    if (from <= to)
+    {
+        print(from)
+        countFrom(from + 1, to: to)
+    }
+}
+
+
+
+

learning_swift-daniel_seong.playground/contents.xcplayground

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>