Swift solution Algorithms/challenges/tr/tr.md

iOS Algs.playground/Contents.swift

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+import UIKit
+
+func tr(from: String, to: String, test: String) -> String {
+    var fromArray = Array(from.characters)
+    var toArray = Array(to.characters)
+    let testArray = Array(test.characters)
+    var testDictionary: [String : String] = [:]
+    var stupidNewArray: [String] = []
+    var result: String = ""
+    if fromArray.count != toArray.count {
+        return "Bad from/to string"
+    }
+    for char in 0..<fromArray.count {
+        testDictionary[String(fromArray[char])] = String(toArray[char])
+    }
+
+    for char in testArray {
+        if testDictionary.keys.contains(String(char)) {
+            stupidNewArray.append(testDictionary[String(char)]!)
+        }
+        else {
+            stupidNewArray.append(String(char))
+        }
+    }
+    for letter in stupidNewArray {
+        result += letter
+    }
+    return result
+}
+tr(from: "1a", to: "a1", test: "aax11")
+
+//tr("1a","a1","aax11") => "11xaa"

iOS Algs.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>