Here is an updated UI for Advent of Code with REPL behavior enabled. You can now evaluate expressions bit by bit: https://squint-cljs.github.io/squint/?boilerplate=https%3A%2F%2Fgist.githubusercontent.com%2Fborkdude%2Fcf94b492d948f7f418aa81ba54f428ff%2Fraw%2Fa64b304b4025cceb1fefc0acd2812692a2dcdb9c%2Faoc_ui.cljs&src=OzsgSGVscGVyIGZ1bmN0aW9uczoKOzsgKGZldGNoLWlucHV0IHllYXIgZGF5KSAtIGdldCBBT0MgaW5wdXQKOzsgKGFwcGVuZCBzdHIpIC0gYXBwZW5kIHN0ciB0byBET00KOzsgKHNweSB4KSAtIGxvZyB4IHRvIGNvbnNvbGUgYW5kIHJldHVybiB4CgooZGVmIGlucHV0ICgtPj4gKGpzLWF3YWl0IChmZXRjaC1pbnB1dCAyMDIyIDEpKQogICAgICAgICAgICAgI19zcHkKICAgICAgICAgICAgIHN0ci9zcGxpdC1saW5lcwogICAgICAgICAgICAgKG1hcHYgcGFyc2UtbG9uZykpKQoKKGRlZm4gcGFydC0xCiAgW10KICAoLT4%2BIGlucHV0CiAgICAocGFydGl0aW9uLWJ5IG5pbD8pCiAgICAodGFrZS1udGggMikKICAgIChtYXAgIyhhcHBseSArICUpKQogICAgKGFwcGx5IG1heCkpKQoKKGRlZm4gcGFydC0yCiAgW10KICAoLT4%2BIGlucHV0CiAgICAocGFydGl0aW9uLWJ5IG5pbD8pCiAgICAodGFrZS1udGggMikKICAgIChtYXAgIyhhcHBseSArICUpKQogICAgKHNvcnQtYnkgLSkKICAgICh0YWtlIDMpCiAgICAoYXBwbHkgKykpKQoKKHRpbWUgKHBhcnQtMSkpCiNfKHRpbWUgKHBhcnQtMikp&repl=true

Made a stable link here which auto-redirects to the most up to date playground: https://squint-cljs.github.io/squint/examples/aoc/index.html

https://squint-cljs.github.io/squint/?repl=true&src=KHJlcXVpcmUgJ1siaHR0cHM6Ly9jZG4uanNkZWxpdnIubmV0L25wbS9qcy1jb21iaW5hdG9yaWNzQDIuMS4yL2NvbWJpbmF0b3JpY3MubWluLmpzIgogICAgICAgICAgIDphcyBjIDpyZWZlciBbUGVybXV0YXRpb25dXSkKCih2ZWMgKG5ldyBQZXJtdXRhdGlvbiBbMSAyIDMgNF0gMikp

If you want to help me out and you've done Advent of Code in the past (with CLJS), test-drive your solutions here and let's implement missing functions (or detect bugs) in squint: https://clojurians.slack.com/archives/C0GLTDB2T/p1700757044359719