diff --git a/typescript/217-Contains-Duplicate.ts b/typescript/217-Contains-Duplicate.ts
new file mode 100644
index 000000000..f569cdf6e
--- /dev/null
+++ b/typescript/217-Contains-Duplicate.ts
@@ -0,0 +1,10 @@
+function containsDuplicate(nums: number[]): boolean {
+  const set = new Set();
+
+  for (let i = 0; i < nums.length; i++) {
+    if (set.has(nums[i])) return true;
+    else set.add(nums[i]);
+  }
+
+  return false;
+}
diff --git a/typescript/242-Valid-Anagrams.ts b/typescript/242-Valid-Anagrams.ts
new file mode 100644
index 000000000..4ec3da0ce
--- /dev/null
+++ b/typescript/242-Valid-Anagrams.ts
@@ -0,0 +1,16 @@
+function isAnagram(s: string, t: string): boolean {
+  if (s.length !== t.length) return false;
+
+  const store = new Array(26).fill(0);
+
+  for (let i = 0; i < s.length; i++) {
+    store[s.charCodeAt(i) - 'a'.charCodeAt(0)]++;
+    store[t.charCodeAt(i) - 'a'.charCodeAt(0)]--;
+  }
+
+  for (let i = 0; i < store.length; i++) {
+    if (store[i] !== 0) return false;
+  }
+
+  return true;
+}