diff --git "a/leetcode3/\354\240\225\354\247\204\354\230\201/242. Valid Anagram" "b/leetcode3/\354\240\225\354\247\204\354\230\201/242. Valid Anagram"
new file mode 100644
index 00000000..cd27199d
--- /dev/null
+++ "b/leetcode3/\354\240\225\354\247\204\354\230\201/242. Valid Anagram"	
@@ -0,0 +1,12 @@
+/**
+ * @param {string} s
+ * @param {string} t
+ * @return {boolean}
+ */
+var isAnagram = function(s, t) {
+   const a = s.split("").sort().join("");
+   const b = t.split("").sort().join("");
+
+   if (a == b) return true;
+   else return false;
+};
diff --git "a/leetcode3/\354\240\225\354\247\204\354\230\201/413. Arithmetic Slices" "b/leetcode3/\354\240\225\354\247\204\354\230\201/413. Arithmetic Slices"
new file mode 100644
index 00000000..4dcbc837
--- /dev/null
+++ "b/leetcode3/\354\240\225\354\247\204\354\230\201/413. Arithmetic Slices"	
@@ -0,0 +1,21 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var numberOfArithmeticSlices = function(nums) {
+    let count = 0;
+    let ans = 0;
+
+    if (nums.length <= 2) return 0;
+
+    for (let i = 2; i<nums.length; i++){
+        if ((nums[i] - nums[i-1]) == (nums[i-1] - nums[i-2])){
+            count++;
+            ans += count;
+        } else {
+            count = 0;
+        }
+    }
+
+    return ans;
+};