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Linked List Comprehension Questions

Question Response
1. What advantages does a LinkedList have over an Array? linked list is faster then array and it is easy to add and delete element from the linked list.
2. When is an Array more advantageous? Accessing an element in an array is faster.
3. When is an Array more advantageous?

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
# Time complexity - ?
# Space complexity - ?
# Time complexity - 0(1)
# Space complexity - 0(1)
def add_first(data)
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👍

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - 0(1)
# Space complexity - 0(1)
def get_first
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👍

lib/linked_list.rb
# Time complexity - ?
# Space complexity - ?
# Time complexity - 0(n)
# Space complexity - 0(1)
def length
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👍

lib/linked_list.rb

end

# Time complexity - ?
# Space complexity - ?
def get_at_index(index)
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What about if the index is greater than the length of the list?

lib/linked_list.rb

# Time complexity - ?
# Space complexity - ?
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
end
current = head
if current == nil
self.add_first(data)
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Good re-use of a method

lib/linked_list.rb
end

# Time complexity - ?
# Time complexity - 0(n)
# Space complexity - ?
def add_last(data)
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👍

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@sarashahbaig @CheezItMan