Adding mutating input Solution for 2635-apply-transform-over-each-element-in-array

workspaces/javascript-leetcode-month/problems/2635-apply-transform-over-each-element-in-array/solution.md

@@ -454,6 +454,20 @@ function map<TIn, TOut>(
 }
 ```
 
+Also, since the output is the same size as the input, you could modify the array to save space:
+
+[View submission on LeetCode](https://leetcode.com/problems/apply-transform-over-each-element-in-array/submissions/1380674098/)
+
+```typescript []
+function map<TIn>(arr: TIn[], fn: (element: TIn, index: number) => TIn): TIn[] {
+  for (let i = 0; i < arr.length; ++i) {
+    arr[i] = fn(arr[i], i);
+  }
+
+  return arr;
+}
+```
+
 ## Answers to Bonus Questions
 
 1. **What is the significance of the `void`s in `Generator<number, void, void>`?**

workspaces/javascript-leetcode-month/problems/2635-apply-transform-over-each-element-in-array/solutions/iterative-loops/using-classic-for-mutating-input.ts

@@ -0,0 +1,7 @@
+function map<TIn>(arr: TIn[], fn: (element: TIn, index: number) => TIn): TIn[] {
+  for (let i = 0; i < arr.length; ++i) {
+    arr[i] = fn(arr[i], i);
+  }
+
+  return arr;
+}