TL;DR
You may find the Discrete Fourier Transform algorithm in JavaScript Algorithms repository.
Discrete Fourier Transform
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The first image is the best illustration ever!
Yeah! That's true
Hi Oleksii, thanks for this article and for your GitHub repo (javascript-algorithms) in general, i will need this tutorial to code a specific audio feature one day into a JS music app. The FFT is quite hard to apprehend.
Yes, for me personally it is also not an easy topic. Good luck with JS music app!
It was in 1974 when I first saw a similar frequency domain image in an introductory electronics book: it clarified everything!