Create 268-Missing-Number.js

veerbia · web-flow · commit 42d81ba833d5 · 2022-04-03T12:40:05.000-07:00
diff --git a/javascript/268-Missing-Number.js b/javascript/268-Missing-Number.js
@@ -0,0 +1,24 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var missingNumber = function(nums) {
+    nums.sort((a,b) => {return a-b});
+    
+    if (nums[nums.length - 1] !== nums.length) {
+        return nums.length;
+    } else if (nums[0] !== 0) {
+        return 0;
+    }
+    
+    for (let i = 0; i < nums.length; i++) {
+        if(nums[i + 1] !== nums[i] + 1) {
+            return nums[i] + 1;
+        }
+    }
+    
+    return -1;
+    
+    
+    
+};
