sum-of-unique-elements

leetcode/hash-table/sum-of-unique-elements/anunihu-james.js

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+var sumOfUnique = function (nums) {
+  let resultArr = [];   // Empty array to store unique numbers
+  for (const num of nums) {  // Loop through the array
+    if (nums.indexOf(num) === nums.lastIndexOf(num)) {  // Conditional statement
+      resultArr.push(num);   // Push unique numbers into the empty array
+    }
+  }
+  if (resultArr.length === 0) {
+    return 0;
+  } else {
+    return resultArr.reduce((a, b) => a + b);   // returns the sum of the numbers in the result array
+  }
+};
+
+// The time complexity is O(N) and the space complexity is also O(N).