twoSum solution3

Author: hyejj19

two-sum/hyejj19.ts

@@ -1,11 +1,15 @@
 function twoSum(nums: number[], target: number): number[] {
   const table = new Map();
-  nums.forEach((num, idx) => table.set(num, idx));
 
   for (let i = 0; i < nums.length; i++) {
-    const result = target - nums[i];
-    if (table.has(result) && table.get(result) !== i) {
-      return [i, table.get(result)];
+    const complement = target - nums[i];
+
+    if (table.has(complement)) {
+      return [table.get(complement)!, i];
     }
+
+    table.set(nums[i], i);
   }
+
+  return [];
 }