🐱

Yifan Pan catnipan

🐱

catnipan / useStateWithAction.ts

Last active February 8, 2024 21:21

state machine: add handler to state in a type safe way

	type AnyState = { step: string };
	type AnyActionMap = Record<string, (...args: any[]) => unknown>;
	type AnyAction<State extends AnyState> = {
	[S in State['step']]?: (
	state: { step: S } & State,
	setState: (newState: SetStateAction<State>) => void
	) => AnyActionMap;
	};

	type StateWithActions<

catnipan / recurrence_macro.rs

Last active January 4, 2021 19:53

recurrence - a Rust macro example

	// Credit to https://danielkeep.github.io/practical-intro-to-macros.html

	macro_rules! count_exprs {
	() => (0);
	($head:expr $(, $tail:expr)) => (1 + count_exprs!($($tail),));
	}

	macro_rules! recurrence {
	( $seq:ident [ $ind:ident ]: $sty:ty = $recur:expr, $($inits:expr),+) => {
	{