Sha256: 9b1924bd188aa0ce7ab25d4fe8779e1e909d7eb9b38aff6d65089ab41dd4b2d7
Contents?: true
Size: 1.08 KB
Versions: 139
Compression:
Stored size: 1.08 KB
Contents
Implement a doubly linked list. Like an array, a linked list is a simple linear data structure. Several common data types can be implemented using linked lists, like queues, stacks, and associative arrays. A linked list is a collection of data elements called *nodes*. In a *singly linked list* each node holds a value and a link to the next node. In a *doubly linked list* each node also holds a link to the previous node. You will write an implementation of a doubly linked list. Implement a Node to hold a value and pointers to the next and previous nodes. Then implement a List which holds references to the first and last node and offers an array-like interface for adding and removing items: * `push` (*insert value at back*); * `pop` (*remove value at back*); * `shift` (*remove value at front*). * `unshift` (*insert value at front*); To keep your implementation simple, the tests will not cover error conditions. Specifically: `pop` or `shift` will never be called on an empty list. If you want to know more about linked lists, check [Wikipedia](https://en.wikipedia.org/wiki/Linked_list).
Version data entries
139 entries across 139 versions & 1 rubygems