Coding Challenge Practice – Question 51

Implement a function to reverse a linked list. The boilerplate code:

const reverseLinkedList = (list) => {
// your code
}

Set the new head to null, and list is the current node being reversed.

let prev = null;
let curr = list

F…


This content originally appeared on DEV Community and was authored by Bukunmi Odugbesan

Implement a function to reverse a linked list. The boilerplate code:

const reverseLinkedList = (list) => {
    // your code
}

Set the new head to null, and list is the current node being reversed.

let prev = null;
let curr = list

For each node, save the next node temporarily, reverse the link and move curr and prev forward.

while(curr) {
const next = curr.next;
curr.next = prev;
prev = curr;
curr = next;

When the loop ends, prev points to the new head of the reversed list. The final code:

const reverseLinkedList = (list) => {
    // your code
    let prev = null;
    let curr = list;

    while(curr) {
        const next = curr.next;
        curr.next = prev;
        prev = curr;
        curr = next
    }
    return prev;
}

That's all folks!


This content originally appeared on DEV Community and was authored by Bukunmi Odugbesan


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