missing number solution

Author: yoon-turtle

missing-number/yoonthecoder.js

@@ -0,0 +1,14 @@
+var missingNumber = function (nums) {
+  // store all the elemenst from nums in a Set
+  const set = new Set(nums);
+
+  // check the missing number by iterating through the index
+  for (i = 0; i <= nums.length; i++) {
+    if (!set.has(i)) {
+      return i;
+    }
+  }
+};
+
+// Time complexity: O(n);
+// Space complexity: O(n);