Sara - Branches #44
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Sara - Branches #44
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CheezItMan
reviewed
Feb 23, 2020
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Nice work, you hit all the learning goals here. Well done. Take a look at my comments and let me know if you have questions. The methods you have written all work and you've demonstrated an understanding of how to implement a Linked List. I had trouble finding things to comment on. Very nicely done.
| @@ -19,99 +19,270 @@ def initialize | |||
| # method to add a new node with the specific data value in the linked list | |||
| # insert the new node at the beginning of the linked list | |||
| def add_first(value) | |||
| raise NotImplementedError | ||
| # raise NotImplementedError | ||
| @head = Node.new(value, @head) | ||
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| end | ||
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| # method to find if the linked list contains a node with specified value | ||
| # returns true if found, false otherwise | ||
| def search(value) |
| end | ||
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| # method to return the max value in the linked list | ||
| # returns the data value and not the node | ||
| def find_max |
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| return max.data | ||
| end | ||
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| # method to return the min value in the linked list | ||
| # returns the data value and not the node | ||
| def find_min |
| end | ||
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| return min | ||
| end | ||
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| # method that returns the length of the singly linked list | ||
| def length |
| @head = current.next | ||
| else | ||
| previous.next = current.next | ||
| end | ||
| end | ||
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| # method to reverse the singly linked list | ||
| # note: the nodes should be moved and not just the values in the nodes | ||
| def reverse |
| end | ||
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| ## Advanced Exercises | ||
| # returns the value at the middle element in the singly linked list | ||
| def find_middle_value |
| # fast = @root | ||
| # slow = @root | ||
| # until fast.nil? | ||
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| # find the nth node from the end and return its value | ||
| # assume indexing starts at 0 while counting to n | ||
| def find_nth_from_end(n) |
| end | ||
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| # Additional Exercises | ||
| # returns the value in the first node | ||
| # returns nil if the list is empty | ||
| def get_first |
| return nil | ||
| else | ||
| return @head.data | ||
| end | ||
| end | ||
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| # method that inserts a given value as a new last node in the linked list | ||
| def add_last(value) |
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