extract<R> abstract method

R extract<R>(
  1. R fn<A, B>(
    1. Decodable<A>? decodableA,
    2. Decodable<B>? decodableB
    )
)

Extracts the child Decodables for the type parameters A and B from the composed Decodable for type T<A, B>.

Implementation

R extract<R>(R Function<A, B>(Decodable<A>? decodableA, Decodable<B>? decodableB) fn);