Sets are a great way to boost the performance of your JavaScript or TypeScript application. Explore all of the features of Sets, including the new 2025 methods. 

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00:00 Introduction
00:19 Jupyter Notebooks with JavaScript
00:53 Creating Sets
03:35 Looking Up Values in a Set
05:04 Comparing Sets
08:16 Set Performance vs Arrays
09:34 Building Pub Sub with Set
12:35 Outroduction

Jack Herrington

Sets are a high-performance data structure in JavaScript that only allow unique values, providing efficient O(1) time complexity for operations. This post discusses how to create and manipulate sets, including operations like add, delete, clear, and how to convert sets back to arrays. It also explores new methods for comparing sets such as union, intersection, difference, and symmetric difference. The use of Jupyter Notebooks with JavaScript through Deno and their benefits for coding and experimenting with sets is detailed.

FASTER JavaScript In 2025 With Sets

set operation is actually more like O(N)+O(1) . Because most of time, data need to be transformed into set from array. transformation job is not small job to ignore

Set is just missing built-in methods like “reduce”, “map”, “filter”, …