diff --git a/lab13/rabbit.js b/lab13/rabbit.js
index 8dc4e8b..5467cad 100644
--- a/lab13/rabbit.js
+++ b/lab13/rabbit.js
@@ -1,9 +1,11 @@
-name = "Monty";
+/*global console*/
+/*jslint this*/
+var name = "Monty";
+var r = new Rabbit("Python");
+
 function Rabbit(name) {
-  this.name = name;
+    this.name = name;
 }
-var r = Rabbit("Python");
 
 console.log(r.name);  // ERROR!!!
 console.log(name);    // Prints "Python"
-
diff --git a/lab13/rabbit.ts b/lab13/rabbit.ts
new file mode 100644
index 0000000..c9286a1
--- /dev/null
+++ b/lab13/rabbit.ts
@@ -0,0 +1,15 @@
+// rabbit.ts
+
+class Rabbit {
+    name: string;
+
+    constructor(name: string) {
+        this.name = name;
+    }
+}
+
+let myName: string = "Monty";
+let r: Rabbit = new Rabbit("Python");
+
+console.log(r.name); // ERROR!!!
+console.log(myName); // Prints "Python"
diff --git a/lab13/sortAndGetLargest.js b/lab13/sortAndGetLargest.js
index 54d5994..0001ac1 100644
--- a/lab13/sortAndGetLargest.js
+++ b/lab13/sortAndGetLargest.js
@@ -1,15 +1,28 @@
-function swap(arr,i,j) {
-  tmp = arr[i]; arr[i] = arr[j]; arr[j] = tmp;
-}
-function sortAndGetLargest (arr) {
-  tmp = arr[0]; // largest elem
-  for (i=0; i<arr.length; i++) {
-    if (arr[i] > tmp) tmp = arr[i];
-    for (j=i+1; j<arr.length; j++)
-      if (arr[i] < arr[j]) swap(arr,i,j);
-  }
-  return tmp;
-}
-var largest = sortAndGetLargest([99,2,43,8,0,21,12]);
-console.log(largest); // should be 99, but prints 0
+/*global console*/
+/*jslint for */
 
+var largest = sortAndGetLargest([99, 2, 43, 8, 0, 21, 12]);
+
+function swap(arr, i, j) {
+    var tmp = arr[i];
+    arr[i] = arr[j];
+    arr[j] = tmp;
+}
+function sortAndGetLargest(arr) {
+    var tmp = arr[0]; // largest elem
+    var i;
+    var j;
+    for (i = 0; i < arr.length; i += 1) {
+        if (arr[i] > tmp) {
+            tmp = arr[i];
+        }
+        for (j = i + 1; j < arr.length; j += 1) {
+            if (arr[i] < arr[j]) {
+                swap(arr, i, j);
+            }
+        }
+    }
+    return tmp;
+}
+
+console.log(largest); // should be 99, but prints 0
diff --git a/lab13/sortAndGetLargest.ts b/lab13/sortAndGetLargest.ts
new file mode 100644
index 0000000..5edbabb
--- /dev/null
+++ b/lab13/sortAndGetLargest.ts
@@ -0,0 +1,28 @@
+// sortAndGetLargest.ts
+
+function swap(arr: number[], i: number, j: number): void {
+    const tmp: number = arr[i];
+    arr[i] = arr[j];
+    arr[j] = tmp;
+}
+
+function sortAndGetLargest(arr: number[]): number {
+    if (arr.length === 0) {
+        throw new Error("Array must not be empty");
+    }
+
+    // Sort the array in descending order
+    for (let i = 0; i < arr.length; i += 1) {
+        for (let j = i + 1; j < arr.length; j += 1) {
+            if (arr[i] < arr[j]) {
+                swap(arr, i, j);
+            }
+        }
+    }
+
+    // The largest element is now at index 0
+    return arr[0];
+}
+
+const largest: number = sortAndGetLargest([99, 2, 43, 8, 0, 21, 12]);
+console.log(largest); // should be 99, but prints 0