![]() ![]() ![]() □įigure 3: A doubly linked list with pointer to the previous elementĮven though the behavior is similar, we need to update the Singly List functions such as addAtHead, removeAtHead, search and others to consider the previous property. So easy, right? □ You can feeling that we are having progress. With basic understanding of Linked List, it is so easy to build and extend functionality to make it a Double List. As consequence, is required more space to store the addresses of previous elements instead just one to the next element in list, so takes two more memory comparing with the singly structure.īesides that, mostly all functions and behaviors are quite similar with the Singly List. For instance, each node has a pointer to the previous element, allowing you to move through the list from the tail, as show in the picture below.Īs Uncle Ben said to Peter Parker, “with great power comes great responsibility”. Now we gain the power to move traversed backward in the list. ⚡️ But if you would like to know how I implemented, you can access all the code just clicking here.Īs I mentioned earlier, the Doubly Linked List is a structure that has capacity to pointer to the previous node, which is the biggest difference comparing with the Singly List. There are others functions like getAtIndex, addAtIndex, removeAt and reverse that I would like to discuss, but they have similar logic applies as the previous methods described before, so I’ll skip the explanation of them to not waste your time. Is called as singly because a node only hold a reference to the next element of the sequence and you cannot access previous elements because it does not store any pointer or reference to the previous node, as you can see in the figure.įigure 2: A singly linked list that contain an element and a pointer to the next nodeīefore we describe the operations, we need to define the most important part in our code that will help us to build the linear list structure, the node class.Įnter fullscreen mode Exit fullscreen mode At the beginning, we are going to focus in the Linked List, because it is the most common and simplest data structure linear collection of data elements. Now that we are on the same page with the concepts, let’s start the discussion more deeply about Linked List methods, translate the concepts into to our code, and finally implement our data structure. You can see more about in Doubly Linked List Structure.
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