Dani - Leaves #33
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Dani - Leaves #33
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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. There are a few like delete which aren't done. Let me know if you have questions on how to implement them.
| @@ -19,54 +19,125 @@ 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 | |||
| new_node = Node.new(value, @head) | |||
| @head = new_node | |||
| 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) | |||
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| current = current.next | ||
| end | ||
| return found | ||
| 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 |
lib/linked_list.rb
Outdated
| return nil if @head == nil | ||
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| current = @head | ||
| min = 0 |
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What if all the elements are negative numbers?
Suggested change
| min = 0 | |
| min = current.data |
| end | ||
| current = current.next | ||
| end | ||
| return min | ||
| end | ||
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| # method that returns the length of the singly linked list | ||
| def length |
| length += 1 | ||
| current = current.next | ||
| end | ||
| return length | ||
| end | ||
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| # method that returns the value at a given index in the linked list | ||
| # index count starts at 0 | ||
| # returns nil if there are fewer nodes in the linked list than the index value | ||
| def get_at_index(index) |
| end | ||
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| # method to delete the first node found with specified value | ||
| def delete(value) | ||
| raise NotImplementedError | ||
| return nil if @head == nil | ||
| 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 |
| @@ -79,7 +150,25 @@ def find_middle_value | |||
| # 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) | |||
| @@ -94,18 +183,41 @@ def has_cycle | |||
| # returns the value in the first node | |||
| # returns nil if the list is empty | |||
| def get_first | |||
| return @head | ||
| 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) |
| current = current.next | ||
| end | ||
| current.next = new_last_node | ||
| 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 |
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