This passage is about a linked list, which is a type of data structure. It explains how to append a node to the linked list and test if it has been appended correctly. The code tests that the head and tail nodes are null before appending, then checks that the node was added correctly by verifying that the tail’s next node is null.
By using the push method, one can easily append a node at the end of the linked list. So, if you need to add or remove nodes from your linked list, don’t hesitate to use the Node class for an efficient implementation.
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