p5.js
p5.js is a JavaScript library for creative coding, making it accessible to artists, designers, educators, and beginners. It provides a full set of drawing functionality for the HTML5 canvas element, along with features for interactivity, animation, and data visualization. The library is inspired by the Processing language and aims to bring its philosophy of making coding approachable to the web.
Developers should learn p5.js when creating interactive art, data visualizations, educational tools, or prototypes that require graphical output in web browsers. It's particularly useful for projects where ease of use and rapid iteration are priorities, such as in creative coding workshops, digital art installations, or teaching programming concepts visually. The library simplifies complex graphics programming, allowing focus on creative expression rather than low-level canvas APIs.