47. reverse a linked list

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Another basic algorithm even for Front End developers.

You are asked to reverse a linked list.

Suppose we have Node interface like this

class Node {
   new(val: number, next: Node);
   val: number
   next: Node

We can then chain nodes together to create a linked list.

const Three = new Node(3, null)
const Two = new Node(2, Three)
const One = new Node(1, Two)

//now we have  a linked list
// 1 → 2 → 3

Now how can you reverse it to 3 → 2 → 1 ? you can modify the next property of each node, but not the val.

Follow up

Could you solve it with and without recursion?

Let's try to solve this problem within 10 mintues.