Data commit

Task/Caesar-cipher/Wren/caesar-cipher.wren

@@ -0,0 +1,26 @@
+class Caesar {
+    static encrypt(s, key) {
+        var offset = key % 26
+        if (offset == 0) return s
+        var chars = List.filled(s.count, 0)
+        for (i in 0...s.count) {
+            var c = s[i].bytes[0]
+            var d = c
+            if (c >= 65 && c <= 90) { // 'A' to 'Z'
+                d = c + offset
+                if (d > 90) d = d - 26
+            } else if (c >= 97 && c <= 122) {  // 'a' to 'z'
+                d = c + offset
+                if (d > 122) d = d - 26
+            }
+            chars[i] = d
+        }
+        return chars.reduce("") { |acc, c| acc + String.fromByte(c) }
+    }
+
+    static decrypt(s, key) { encrypt(s, 26 - key) }
+}
+
+var encoded = Caesar.encrypt("Bright vixens jump; dozy fowl quack.", 8)
+System.print(encoded)
+System.print(Caesar.decrypt(encoded, 8))