I am interested in simulators, especially in simulators of analogue circuits. Do you have any recommendations on where to start reading about algorithms that lie at the core of simulators?
Also, how was the experience developing such product with JS?
I answered a similar question on Electronics StackExchange where someone asked about how to build a circuit simulator: https://electronics.stackexchange.com/a/394069
From a software developer perspective: lots and lots and lots of automated tests, each of which builds a circuit, runs a simulation, and makes sure we don't see any behavior regression. More lines of code in tests than in the core simulation engine or device models!
Outside of that most simpler stuff (e.g. analog math using opamps, discrete stuff) works perfectly fine. I love it for education and quick "sanity check" simulations.
The JS experience wasn't great. We used emscripten and the tooling barely worked for the simulator core. The rest of the app wasn't bad, but we used polymer / webcomponents which was a big mistake IMO
[0] https://www.amazon.com/Continuous-System-Simulation-François...
For information about the theory behind this, see Electronic Circuit & System Simulation Methods by Pillage