object/pipe_compose_utils library

Pipe (chain unary functions). Compose (f(g(x))). Once (run block only once). Roadmap #246-248.

Functions

compose<T, M, R>(R f(M), M g(T)) → R Function(T)

Returns the mathematical composition f(g(x)): applies g first, then f.

once(void block()) → void Function()

Returns a callable that runs block only on its first invocation and is a no-op thereafter. Useful for one-time initialization guards.

pipe<T, R>(List<R Function(dynamic)> fns) → R Function(T)

Builds a function that threads its input left-to-right through fns, passing each result to the next. Throws a StateError if the final value is not assignable to R.