Merge pull request sadanandpai#26 from ayush013/main

Fixed #Q14 nested array flattening

Author: sadanandpai

challenges/async-challenges.md

@@ -112,8 +112,8 @@ In the 2nd solution, recursive setTimeout is used.
 const num1 = 1, num2 = 10;
 let i = num1;
 const intervalId = setInterval(() => {
-    console.log(++i);
-    if (i === num2)
+    console.log(i++);
+    if (i === num2 + 1)
         clearInterval(intervalId);
 }, 1000);
 ```

challenges/collections-challenges.md

@@ -344,7 +344,7 @@ function flat(arr){
     const flatArr = [];
     arr.forEach((value) => {
         if(Array.isArray(value)){
-            flat(value);
+            flatArr.push(...flat(value));
         }
         else{
             flatArr.push(value);