calculang

CalcWithDec.dev 🧮👨‍💻

 

functional language

• calculations described by pure-functions with no side-effects
  • purity: same inputs => same outputs; predictability for calculations
• no side-effects facilitates safe recalculation
  • when we want to validate, or investigate calculations, for example
• comparable to “formulae” in spreadsheet parlance

only for calculations

• This is not a bug!
• Forces separation of concerns: numbers/calcs separate from applications
• For applications BYOL

this is a wide scope on computers

what does separation of concerns do/can do?

• encapsulate calculations/numbers/workings (without other messing)
• frictionless transparency into calculations/numbers/workings
• facilitate sharing numbers and a defined link to their calculations/workings

also:

• with a domain-specific language for numbers, we can make specialised tools for numbers
  • explore, interpret, visualize, …
• and we can develop a language for flexible and re-usable formulae

 

current implementation details

• calculang-js: looks like JS/ESM (but invalid) and cul-js compiles calculang to (valid) JS/ESM
  • cul-js piggybacks off tools like babel and webpack 🙌

calculang is free software

GitHub calculang/calculang

Twitter @calculang

Fosstodon @calculang

calculang website & community gallery TBC

• but draft website examples… LINK

Applications

calculang is unopinonated about how used (in theory).

• (but in practice…) implementation output is a JS bundle and ESM code

‘little calcu helpers’

• calcudata is a convenient way to pull results from calculang models

• calcuvizspec uses calcudata to map model formulae/inputs directly to visualization channels (thanks UW IDL and Vega Lite).

See code for example applications in ➤ Code blocks within applications.

Previous presentations:

• BelfastJS “little applications” Tracing calcs, Raycasting, Sunsets!
• calcuvizspec visualization API to visualize! (1x option)

DX YouTube video (almost out of date)

Other content

about to be harvested into a community gallery!

• Hearty maths ❤️, my first blog post on CalcWithDec.dev
• You 👉 be the finance minister 🎩 modular!
• Pension calculator modular, recycles tax calcs!
• Sunsets interactions and animations 🌞🌞
• Raycasting 3d worlds 🧱🔫, a slightly-rushed competition entry for maths education (will improve and post to CalcWithDec)

Mixed up/older examples:

• calcy-quarty-vizys | devtools
• My calculang Observable HQ collection
  • Arty examples calculang and a fern, Function from Copacabana 🎶🏖🌊🩴, Function from São Paulo 🌇🎨

calculang.party

A short-term goal is to publish a community gallery of calculang models and visualizations.

Feel free to talk to me if you want to publish a model! 😊

other calculang future

• Browser extension (issue #5)

• Wikipedia calculations ?: reproduce some, share?

• language integrations e.g. Python, Julia

• tools (“explore, interpret, visualize”…)

• other language targets, optimisation engine (long term for me)

Connect

CalcWithDec.dev

• my website and blog
• Contact or connect on LinkedIn or GitHub

Twitter @calculang

Fosstodon @calculang

YouTube @CalcWithDec

Slides

This QR code will bring you to a webpage of slide contents.

To go to the draft website examples we looked at then scroll to end and click HERE ⏩ (works better on desktop!).

Questions ❓