⚡️ Lightning Demo

Nextjournal is a hosted notebook platform for literate programming.

Goals:

  • better way to present ideas compared to status quo (PDFs)

  • run existing code: not learn a new language

  • reproducibility: apply immutability to document, data and environment (docker image) to make sure things keep running

🌈 Standard Notebooks features

randn(5)
0.4s
Julia
Julia 1.2
5-element Array{Float64,1}: 0.390714 0.376106 -0.865263 -0.492898 0.201777
library(ggplot2)
theme_set(theme_classic())
# Histogram on a Continuous (Numeric) Variable
g <- ggplot(mpg, aes(displ)) + scale_fill_brewer(palette = "Spectral")
g + geom_histogram(aes(fill=class), binwidth = .1, col="black", size=.1) +
  labs(title="Histogram with Auto Binning", 
       subtitle="Engine Displacement across Vehicle Classes")
0.6s
R
R

🗃 Passing Data

Polyglot cells can exchange data by writing to a /results folder.

with open("/results/wave.txt", 'w') as f:
	f.write("Hello Future of Coding 👋")
0.3s
Python
Python 3
empty

Then other cells can access it.

ls NJ__REF_
0.8s
Bash
Minimal Bash

🥾 Custom Components & API

Work-in-progress: extensibility via in-browser runtimes:

(def turtles (reagent.core/atom []))
ClojureScript
→
^{:nextjournal/viewer :reagent}
#(into [:div] (map (fn [s] [:span {:style {:font-size s}} "🐢"])) @turtles)
ClojureScript
→
(dotimes [_ 10]
  (swap! turtles conj (/ (or (last @turtles) 130) 1.2)))
ClojureScript
→

Can also add missing functionality, e.g. clear outputs:

(and (swap! re-frame.db/app-db update-in [:article :nodes]
            #(reduce-kv (fn [m k v]
                          (assoc m k (dissoc v :outputs))) {} %)) :clear!)
ClojureScript
→
:clear!

✨ More

  • realtime collaboration

  • on demand provisioning with powerful machines + GPUs

  • automatic versioning

  • remix existing notebooks

🙏 Thank You

Runtimes (5)