added practice question

Author: ashish8513

Practice/Reverse.js

@@ -0,0 +1,13 @@
+var reverseString = function(s) {
+    let n = s.length;
+    let i = 0;
+    let j = n-1;
+    while(i <= j) {
+        let temp = s[i];
+        s[i] = s[j];
+        s[j] = temp;
+
+        i++;
+        j--;
+    }
+};

Practice/ReverseVowel.js

@@ -0,0 +1,26 @@
+var reverseVowels = function(s) {
+    let vowels = new Set(['a', 'e', 'i', 'o', 'u', 'A', 'E', 'I', 'O', 'U']);
+    let n = s.length;
+    let i = 0;
+    let j = n - 1;
+
+    s = s.split('');
+
+    while (i < j) {
+        while (i < j && !vowels.has(s[i])) {
+            i++;
+        }
+        while (i < j && !vowels.has(s[j])) {
+            j--;
+        }
+
+        let temp = s[i];
+        s[i] = s[j];
+        s[j] = temp;
+
+        i++;
+        j--;
+    }
+
+    return s.join('');
+};

Practice/SumofTwoNO.js

@@ -0,0 +1,10 @@
+var twoSum = function(nums, target) {
+    let n = nums.length;
+    for(let i = 0; i <= n-2; i++) {
+        for(let j = i + 1; j < n; j++) {
+            if(nums[i] + nums[j] == target) {
+                return [i, j];
+            }
+        }
+    }
+};