HashSet in Data Structure

What is a Hash Set in Data Structure?

Hash sets are collections of elements stored using hashes. A hashing algorithm transforms an element into a fixed-size chunk known as a hash.

Basic Hash Set Operations

The following are some of a hash set's functions and properties:

• Hash Algorithm
• Resize Operation
• Insert Operation
• Contains Operation
• Remove Operation

Hash Set Structure

A Hash Set keeps distinct elements in buckets based on their hash code:

• Hash Code: A value generated from an element's key to indicate its bucket in the Hash Set.
• Unique Elements: A hash set prevents multiple occurrences of the same value.
• Bucket: Containers within the Hash Set that store elements; if elements share hash code, they share a bucket, which is commonly implemented as arrays or linked lists.

Advantages of Hash Set

• Unique Elements: HashSet guarantees uniqueness, which is critical when duplicates are not permitted.
• Fast Retrieval: The add, delete, and contain operations have constant time complexity, making them appropriate for larger datasets.
• No precise Order: HashSet does not keep a precise element order, which might be beneficial or harmful depending on the situation.
• Dynamic Sizing: Adjusts size based on element count to optimize memory use.

Applications of Hash Set in Data Structure

• Duplicate Detection
• Intersection and Union of Sets
  
• Caching