LeetCode Remove Nth Node From End of List – Linked List [closed]

I came across this answer on LeetCode for the “Remove Nth Node From End of List” Linked List Problem. https://leetcode.com/problems/remove-nth-node-from-end-of-list/discuss/524116/JavaScript-One-Pass-Two-Pointer

I understand why I need to update curr.next to curr.next.next. But I don’t understand how this change modifies the head too. I thought curr was just a variable.

How does changing curr changes the head too?

Answer

I don’t understand how this change modifies the head too. I thought curr was just a variable.

If this assignment were an assignment to curr you’d be right, and it wouldn’t mutate the list, but the assignment is not to curr, but to curr.next, and that is not a variable, but an attribute of a node in your list. By assigning to that attribute, you effectively mutate that node, and by consequence the list.