memo3<A, B, C, R> function

Func3<A, B, C, R> memo3<A, B, C, R>(
  1. Func3<A, B, C, R> func
)

Checks 3 arguments for equality with == operator and returns the cached result if they were not changed.

Implementation

Func3<A, B, C, R> memo3<A, B, C, R>(Func3<A, B, C, R> func) {
  late A prevArgA;
  late B prevArgB;
  late C prevArgC;
  late R prevResult;
  bool isInitial = true;

  return ((A argA, B argB, C argC) {
    if (!isInitial &&
        argA == prevArgA &&
        argB == prevArgB &&
        argC == prevArgC) {
      return prevResult;
    } else {
      prevArgA = argA;
      prevArgB = argB;
      prevArgC = argC;
      prevResult = func(argA, argB, argC);
      isInitial = false;

      return prevResult;
    }
  });
}