Grokking the Coding Interview: Patterns for Coding Questions
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Issues with Hash Tables

Remember, we said that our earlier Hash Table implementation was naive. By that, we meant that the code doesn't cater to some frequently occurring issues. Let's see what these issues really are.


A collision in a Hash Table occurs when an insert operation tries to insert an item at a table slot already occupied by another item. How can this ever happen? Let's find out.

Collision example

Reconsider our earlier example of the Hash Table for the public library book information storage. Assume, for the sake of simplicity, the Hash Table has the max_length equal to 10




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