What is dynamic resizing in hash maps?

What is dynamic resizing in hash maps?

Dynamic resizing in hash maps refers to the process of adjusting the size of the hash map's underlying array when it reaches a certain load factor, ensuring efficient performance.

Why is dynamic resizing important?

It's important because it helps maintain efficient operations like insertions, deletions, and lookups by preventing excessive collisions and keeping the load factor optimal.

How does the resizing process work?

When a hash map reaches a predefined load factor, it creates a new larger array, rehashes all existing entries, and moves them to the new array.

What are the performance implications of resizing?

Resizing can be costly in terms of time complexity, as it involves rehashing all elements, but it improves performance in the long run by reducing collisions.

Can you give an example of when resizing occurs?

Sure! If a hash map has a capacity of 10 and a load factor of 0.7, resizing will occur when the 8th element is added.