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Learning JavaScript Data Structures and Algorithms

You're reading from   Learning JavaScript Data Structures and Algorithms Enhance your problem-solving skills in JavaScript and TypeScript

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Product type Paperback
Published in Jul 2026
Last Updated in Sep 2025
Publisher Packt
ISBN-13 9781836205395
Length 615 pages
Edition 4th Edition
Languages
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Author (1):
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Loiane Groner Loiane Groner
Author Profile Icon Loiane Groner
Loiane Groner
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Table of Contents (9) Chapters Close

Learning JavaScript Data Structures and Algorithms, Fourth Edition: Enhance your problem-solving skills in JavaScript and TypeScript
1 Introducing Data Structures and Algorithms in JavaScript FREE CHAPTER 2 Big O notation 3 Arrays 4 Stacks 5 Queues and Deques 6 Linked Lists 7 Sets 8 Dictionaries and Hashes

The hash set data structure

A hash set is a collection of unique values (no duplicates allowed). It combines the characteristics of a mathematical set with the efficiency of hash tables. Like hash tables, hash sets use a hash function to calculate a hash code for each element (value) we want to store. This hash code determines the index (bucket) where the value should be placed in an underlying array.

We can reuse the code we created in this chapter to create the hash set data structure as well, but with one important detail: we would need to check for duplicate values before the insertion operation.

The benefits of using hash sets are that it is guaranteed that all values in the set are unique. In JavaScript, the native Set class is considered a hash set data structure as well. For example, we could use a hash set to store all the English words (without their definitions).

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