Data commit

Task/Four-is-magic/Swift/four-is-magic.swift

@@ -0,0 +1,24 @@
+import Foundation
+
+func fourIsMagic(_ number: NSNumber) -> String {
+    let formatter = NumberFormatter()
+    formatter.numberStyle = .spellOut
+    formatter.locale = Locale(identifier: "en_EN")
+
+    var result: [String] = []
+
+    var numberString = formatter.string(from: number)!
+    result.append(numberString.capitalized)
+
+    while numberString != "four" {
+        numberString = formatter.string(from: NSNumber(value: numberString.count))!
+        result.append(contentsOf: [" is ", numberString, ", ", numberString])
+    }
+
+    result.append(" is magic.")
+    return result.joined()
+}
+
+for testInput in [23, 1000000000, 20140, 100, 130, 151, -7] {
+    print(fourIsMagic(testInput as NSNumber))
+}