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Data Structures for Coding Interviews in JavaScript

Solution: Middle of the Linked List

Explore how to find the middle node in a singly linked list using JavaScript. Learn two main techniques: calculating length to locate the midpoint and using two pointers moving at different speeds. Understand their time and space complexity to write efficient, interview-ready code.

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Statement

Given the head of a singly linked list, return the middle node of the linked list.

If there are two middle nodes, return the second middle node. This happens when the length of the list is even, and the second middle node occurs at length2\frac {length}{2}. Otherwise, if the length of the list is odd, the middle node occurs at length2+1\frac {length}{2}+1 ...