Search⌘ K
Home
Courses
Data Structures for Coding Interviews in Java

What is a Hash Table?

Explore the fundamentals of hash tables including how hashing transforms large keys into array indices for constant time data retrieval. Understand key components such as hash functions, collision handling, and table size to improve efficiency in Java applications.

We'll cover the following...

Hashing

Until now, the overall time complexity accomplished in cases of insertion, deletion, and searching approach O(nLogn), or at O(Logn) at minimum in balanced Binary Trees, which is pretty good. But what to do if we want the results in constant time!?

🔍 Hashing, How and Why?

Hashing is a process used to uniquely identify objects and store each object at some pre-calculated unique index called its key. So the object is stored in the form of a key-value pair, and the collection of such items is called “Dictionary”. Each object can be searched using that key in O(1).

For a significantly large amount of data, even O(nLogn) becomes significantly large which might affect the efficiency of an algorithm. Ideally, a data ...