maps.cpp

Either<string, int> myEither = left("hello"); // constructs a either containing a leftValue;

int count = myEither
  .rightMap([](auto num) { return num + 1; }) // adds 1 if rightValue is present
  .leftMap([](auto str) { return str + "world"; }) // appends "world" if leftValue is present
  .leftMap([](auto str) { return str.size(); })
  .join(); // both sides have now the same type, lets join...