diff --git a/week1/day4/hello.js b/week1/day4/hello.js
new file mode 100644
index 0000000..5e0e132
--- /dev/null
+++ b/week1/day4/hello.js
@@ -0,0 +1,2 @@
+var message = "Hello, TypeScript";
+console.log(message);
diff --git a/week1/day4/hello.ts b/week1/day4/hello.ts
new file mode 100644
index 0000000..e3bc7d7
--- /dev/null
+++ b/week1/day4/hello.ts
@@ -0,0 +1,2 @@
+let message: string = "Hello, TypeScript";
+console.log(message);
\ No newline at end of file
diff --git a/week1/day4/practice.js b/week1/day4/practice.js
new file mode 100644
index 0000000..0730fa5
--- /dev/null
+++ b/week1/day4/practice.js
@@ -0,0 +1,40 @@
+var message = "Hello, World";
+function printChars(s) {
+    for (var i = 0; i < s.length; i++) {
+        console.log(s[i]);
+    }
+}
+function printVowels(s) {
+    var vowels;
+    (function (vowels) {
+        vowels[vowels["a"] = 0] = "a";
+        vowels[vowels["e"] = 1] = "e";
+        vowels[vowels["i"] = 2] = "i";
+        vowels[vowels["o"] = 3] = "o";
+        vowels[vowels["u"] = 4] = "u";
+    })(vowels || (vowels = {}));
+    ;
+    for (var i = 0; i < s.length; i++) {
+        if (s[i] in vowels) {
+            console.log(s[i]);
+        }
+    }
+}
+function getProduct() {
+    var nums = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        nums[_i] = arguments[_i];
+    }
+    var total = 1;
+    nums.forEach(function (num) {
+        total *= num;
+    });
+    return total;
+}
+console.log(getProduct(2, 2));
+console.log(getProduct(2, 4));
+console.log(getProduct(3, 3, 3, 3, 3));
+console.log("Characters in Message: ");
+printChars(message);
+console.log("Vowels in Message: ");
+printVowels(message);
diff --git a/week1/day4/practice.ts b/week1/day4/practice.ts
new file mode 100644
index 0000000..b1b4a15
--- /dev/null
+++ b/week1/day4/practice.ts
@@ -0,0 +1,43 @@
+let message: string = "Hello, World";
+
+function printChars(s: string): void {
+    for (let i = 0; i < s.length; i++) {
+        console.log(s[i]);
+    }
+}
+
+function printVowels(s: string): void {
+    enum vowels {
+        'a',
+        'e',
+        'i',
+        'o',
+        'u',
+    };
+
+    for (let i = 0; i < s.length; i++) {
+        if (s[i] in vowels) {
+            console.log(s[i]);
+        }
+    }
+}
+
+function getProduct(...nums: number[]): number {
+    let total: number = 1;
+    
+    nums.forEach(num => {
+        total *= num;
+    });
+
+    return total;
+}
+
+console.log(getProduct(2, 2));
+console.log(getProduct(2, 4));
+console.log(getProduct(3,3,3,3,3));
+
+console.log("Characters in Message: ");
+printChars(message);
+
+console.log("Vowels in Message: ");
+printVowels(message);
\ No newline at end of file