nb5.js: a notebook for p5js sketches (proof of concept)

by Allison Parrish

Made for the "Landscape of Creative Technology" track at the 2019 p5.js Contributor's Conference.

Rationale

I like notebook interfaces. I do most of my work in Jupyter Notebook. Notebooks have a handful of properties that facilitate the kind of work that I do:

• Notebooks are composed of "cells," which are a level of abstraction and reusability that cuts across the level of line and function;
• Cells can be executed out-of-order, making it possible to develop portions of your code independently (without having to re-run everything from scratch);
• Cells can contain code or text, making it easy to interject explanations, documentation and signposts in your code;
• Notebooks can be shared and exported into different formats, producing not "program" but a document of a process.

I use Jupyter Notebook extensively both for development, writing tutorials, and distributing source code for tutorials and workshops. But while notebook software like Jupyter, Observable, and Iodide support JavaScript as a programming language, none of them have built-in, idiomatic support for p5.js, nor are they are not necessarily good matches for p5.js as a tool or as a community.

My criteria for a good p5.js notebook:

• It should work in Global Mode, not just instance mode. Instance mode is awkward and unfamiliar to beginners.
• JavaScript code and sketch code should be visible, not hidden (as it often is in Observable and in Iodide's Report mode).
• It should run p5.js sketches live in the browser.
• It should be as purely browser-based as possible, ideally with the ability to run locally.
• Sketches in the notebook should be read and modify the global JavaScript state, and also able to communicate with each other.
• It should be freely available and open source.

The primary purpose of of a p5.js notebook should be writing and experimenting with p5.js code, not using p5.js as part of a development process for some other language or framework.

There are a number of other attempts to make notebook-like interfaces for p5.js, or to adapt p5.js to an existing notebook interface. Here are the ones I'm aware of.

• Discussions on using p5.js in Observable notebook on the Processing forum
• p5.js in the Jupyter Notebook using the Jupyter Widgets
• Jupyter Notebook magic for Global Mode
• Processing.js in an IPython Notebook

But none of these attempts meet all of the criteria I outlined above. So I decided to make my own! Hence this GitHub repository.

nb5.js proof of concept

I call it nb5.js and the code in here is a proof of concept. The primary structural innovation of my approach is that there are separate cell types for JavaScript code and for p5.js sketches. JavaScript code is executed with eval(), while p5.js sketches are loaded in <iframe> elements with data URLs. There's a global object, nb5, that facilitates sharing data between the JavaScript context of the parent frame and the sketches running in child frames.

What it does so far:

• Create, run and delete text, JavaScript, and p5.js sketch cells
• Call nb5.set('x', val) to make val available to parent frame JavaScript and sketches; nb5.get('x', defaultVal) returns the current value for symbol x, or defaultVal if it hasn't been set (or if the sketch hasn't received the global state yet after running)

Missing functionality (pretty much everything):

• Save, load, export notebooks
• Reorder, cut, copy, paste cells
• Markdown rendering
• etc.

To try it out:

• Clone this repository somewhere
• Start a local web server on port 8000 (try running python -m http.server)
• Open http://localhost:8000/ in the browser
• Have fun!

This is just a proof of concept, intended to help me clarify my ideas and figure out what is possible. It's also a mess. Thank you for coping with it! n its current state!

License

Copyright 2019 Allison Parrish

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.