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branches-Steph #42

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Steph0088
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Linked List Comprehension Questions

Question Response
1. What advantages does a LinkedList have over an Array? That it can be resized as you go and a new data structure doesn't have to be created. It is also useful when you have fragmented memory or not enough contiguous memory.
2. When is an Array more advantageous? When you want to search for something using the index it is more efficient because you don't have to iterate through each one.
3. When is an LinkedList more advantageous? When you are trying to conserve memory. You can also delete and add things faster.

CheezItMan
CheezItMan reviewed Dec 18, 2019
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You definitely have a feel for linked lists, but you have a few bugs here. Take a look at my comments and let me know if you have questions.

lib/linked_list.rb

class LinkedList
attr_reader :head
attr_accessor :length, :tail
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Your not using length or tail so you don't need this line.

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - O(1)
# Space complexity - O(1)
def add_first(data)
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👍

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - O(1)
# Space complexity - O(1)
def get_first
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👍

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - O(1)
# Space complexity - O(1)
def length
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👍

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - O(1)
# Space complexity - O(1)
def add_last(data)
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👍

lib/linked_list.rb
def get_last

current = head
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What if head is nil?

Suggested change
current = head
return nil if head.nil?
current = head

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - O(n)
# Space complexity - O(1)
def get_at_index(index)
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What if index is greater than the length of the list? Something to fix.

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@Steph0088 @CheezItMan