Create 1133-largest-unique-number.js

Author: everthis

1133-largest-unique-number.js

@@ -0,0 +1,19 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const largestUniqueNumber = function(nums) {
+   const hash = {}
+   for(let e of nums) {
+     hash[e] = (hash[e] || 0) + 1
+   }
+   let res = -Infinity
+   Object.keys(hash).forEach(k => {
+     if(hash[k] === 1) {
+       if(+k > res) {
+         res = +k
+       }
+     }
+   })
+   return res === -Infinity ? -1 : res
+};