As an example of how I've been using model composition in calculang, I added notes to ActuarialPlayground.com on manipulating the formulas to do mortgage protection - by composing with an old loan calculator model (via just a plain old URL).

Here are the formula changes, you can interactively swap them on the website, under 💬

github.com/declann/ActuarialPlayground.com/commit/9e487b7e18570e1043ac7f6f4539bf002f8926df#diff-30314a7cf03cb75b72[…]c89a5757d9f62e82a3d1c2d

Hey all! Excited to share a new project some of us (Elliot Boschewitz, Christian Clampitt, Adam Menges, and myself) have been hacking on, Stitch: stitchdesign.app

We’re ready to add people in mass to the TestFlight. It’s an open source version of a visual programming environment, similar to Origami or Quartz Composer.

In addition to being able to build anything those two can, it also supports AR, CoreML, and native 3D support. As well as being built in SwiftUI, so it runs on basically any Apple device and is easy to hack on and improve.

It’s open source, and we welcome new contributions! github.com/StitchDesign/Stitch

Sign up for the Test Flight here: docs.google.com/forms/d/e/1FAIpQLSc4ImI4KpHJNgidj2g_KgAbKqYgt9R1txDl-tWKQxFDKpJkcQ/viewform