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CheezItMan
reviewed
Feb 23, 2020
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Nice work, you hit all the learning goals here. Well done. I really like how you worked to implement the DoublyLinked list. Take a look at my comments and let me know what questions you have. You put together a lot of really elegant code here, it was hard for me to find things to comment on. Impressive!
| class DoublyLinkedList | ||
| def initialize | ||
| @head = nil | ||
| @tail = nil |
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Great idea to have a @tail attribute!
| # raise NotImplementedError | ||
| end | ||
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| def add_first(value) |
| @size += 1 | ||
| end | ||
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| def add_last(value) |
| @size += 1 | ||
| end | ||
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| def get_first |
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| def get_last | ||
| return @tail.data if @tail | ||
| return @tail |
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This method works, but if @tail is nil, I suggest explicitly returning nil here.
Suggested change
| return @tail | |
| return nil |
| single = single.next | ||
| end | ||
| end | ||
| return false | ||
| end | ||
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| # Additional Exercises | ||
| # returns the value in the first node | ||
| # returns nil if the list is empty | ||
| def get_first |
| end | ||
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| # Additional Exercises | ||
| # returns the value in the first node | ||
| # returns nil if the list is empty | ||
| def get_first | ||
| raise NotImplementedError | ||
| return nil if !@head | ||
| return @head.data | ||
| end | ||
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| # method that inserts a given value as a new last node in the linked list | ||
| def add_last(value) |
| last_node.next = Node.new(value) | ||
| else | ||
| @head = Node.new(value) | ||
| end | ||
| end | ||
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| # method that returns the value of the last node in the linked list | ||
| # returns nil if the linked list is empty | ||
| def get_last |
| if last_node | ||
| return last_node.data | ||
| else | ||
| return last_node |
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Suggested change
| return last_node | |
| return nil | |
| return last_node.data | ||
| else | ||
| return last_node | ||
| end | ||
| end | ||
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| # method to insert a new node with specific data value, assuming the linked | ||
| # list is sorted in ascending order | ||
| def insert_ascending(value) |
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