getOrElse<A, B> function

B Function(Either<A, B>) getOrElse<A, B>(B defaultFunction())

Returns a function that, when provided with an Either<A, B>, will yield the value inside if it's a Right, or the result of the defaultFunction if it's a Left.

The returned function acts as a safe way to extract a value from an Either, providing a fallback mechanism when dealing with Left values.

Usage:

final either1 = Right<String, int>(10);
final either2 = Left<String, int>("Error");
final fallback = () => 5;

final value1 = getOrElse(fallback)(either1); // returns 10
final value2 = getOrElse(fallback)(either2); // returns 5

Parameters:

• defaultFunction: A function that returns a value of type B. This value will be returned if the provided Either is a Left.

Returns: A function expecting an Either<A, B> and returning a value of type B.

Implementation

B Function(Either<A, B>) getOrElse<A, B>(B Function() defaultFunction) {
  return match<A, B, B>(
      (leftValue) => defaultFunction(), (rightValue) => rightValue);
}