Linked Lists

A linked list is a data structure consisting of nodes where each node contains data and a reference, or pointer, to the next node in the sequence. In smart contracts, linked lists are used to maintain ordered data or to allow for efficient insertion and deletion of elements.

Unlike arrays, where inserting an element requires shifting all subsequent elements, a linked list only requires updating the pointers of the neighboring nodes. This can be more gas-efficient for certain operations.

However, linked lists are generally more complex to implement and require more storage to maintain the pointers. They are often used in order books or priority queues within financial protocols.

While less common than mappings or arrays, they offer unique advantages for specific data management needs where ordering and frequent updates are required.