Leaves - Mariya #27
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Leaves - Mariya #27
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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. The only method not implemented is insert_ascending. Overall nice job.
| @@ -19,67 +19,190 @@ 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) | |||
| @@ -19,67 +19,190 @@ 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 | |||
| @head = Node.new(value, @head) | |||
| 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) | |||
| current = current.next | ||
| end | ||
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| return false | ||
| 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 |
| current = current.next | ||
| end | ||
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| return max | ||
| 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 |
| current = current.next | ||
| end | ||
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| return min | ||
| end | ||
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| # method that returns the length of the singly linked list | ||
| def length |
| end | ||
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| @head = current | ||
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| end | ||
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| ## Advanced Exercises | ||
| # returns the value at the middle element in the singly linked list | ||
| def find_middle_value |
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👍 , just remember to re-use methods
| current = current.next | ||
| end | ||
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| return middle_node | ||
| end | ||
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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) |
| @@ -94,24 +217,44 @@ def has_cycle | |||
| # returns the value in the first node | |||
| # returns nil if the list is empty | |||
| def get_first | |||
| raise NotImplementedError | ||
| current = @head | ||
| return nil if current.nil? | ||
| return current.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) |
| end | ||
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| current.next = Node.new(value) | ||
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| 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 |
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finished the linked list hw