[utxaa]

> In emacs, for instance, you often use `eval-last-sexp`, by default bound to C-x C-e. This lets you move your cursor to a particular point in the file, often deep in a function, and get the results of just the form(s) you're pointing at.

but that depends on how the environment is looking at the time.

during development, in scheme, i just have a function (reset) that reloads all the files of an app. sometimes i create a thread and poll the filesystem and reload everything that changed in the last second. that way i never have to C-x anything. if i need to eval a subexp i just jump on the repl and do it.

[nerdponx]

Python can hot-reload an application from scratch, too. The idea here is to not reload everything from scratch, but to redefine functions incrementally/iteratively as you work.

[utxaa]

if i change anything in filters.scm then i (load "filters.scm") instead of just sending a snippet to the interpreter to eval. i have this happen when i save the file. same thing, except i never have to worry about sending code or a mis-match between editor and repl. it also forces you to be more organized with code so that you don't override global state. i just code, save, code, save. you can have hooks run things after every save etc ...