Create 1748-sum-of-unique-elements.js

Author: everthis

1748-sum-of-unique-elements.js

@@ -0,0 +1,18 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const sumOfUnique = function(nums) {
+  const m = {}
+  for(let e of nums) {
+      if(m[e] == null) m[e] = 0
+      m[e]++
+  }
+  let res = 0
+  // console.log(m)
+  Object.entries(m).forEach(e => {
+      const [k, v] = e
+      if(v === 1) res += +k
+  })
+  return res
+};