Tools to support live coding as in Bret Victor's “Inventing on Principle” talk

Question

I\'ve watched an already well known video where Bret Victor, former Apple UI designer shows amazing demos with immediate updates of running code after changing literally one

Answer 1

These days for frontend development a lot of the tools offer something called "hot-reloading", basically making your changes in code immediately visible in the browser/mobile emulator. This is independent of the IDE/editor.