Get Node Value Approach

In this lesson, Alvin explores the strategy to solving the following interview problem:

Write a function, get_node_value, that takes in the head of a linked list and an index. The function should return the value of the linked list at the specified index.

If there is no node at the given index, then return None.

a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 2) # 'c'

a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 3) # 'd'

a = Node("a")
b = Node("b")
c = Node("c")
d = Node("d")
a.next = b
b.next = c
c.next = d

# a -> b -> c -> d
get_node_value(a, 7) # None

If you need additional support taking these DSA skills and actually applying them, take Alvin's complete data structures and algorithms course on Structy. You can try out the concepts yourself in their interactive code editor and learn advanced DSA patterns like stack exhaustive recursion.

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