two sum solution

Author: prgmr99

two-sum/prgmr99.js

@@ -0,0 +1,19 @@
+/**
+ * @param {number[]} nums
+ * @param {number} target
+ * @return {number[]}
+ */
+var twoSum = function (nums, target) {
+  const numMap = new Map();
+
+  for (let i = 0; i < nums.length; i++) {
+    const firstNum = nums[i];
+    const secondNum = target - nums[i];
+
+    if (numMap.has(secondNum)) {
+      return [numMap.get(secondNum), i];
+    }
+
+    numMap.set(firstNum, i);
+  }
+};