Iterate

Apply the given function to Either<TLeft, TRight> value according to its state.

Usage

This function is an alternative to Map functions to apply an Action rather a Func delegate.

When Either IsRight

Either<string, int> either = 10;
either.Iterate(
    right => Console.WriteLine(right.ToString()),
    left => Console.WriteLine($"Hello {left}"));

//"10"

When Either IsLeft

Either<string, int> either = " World";
either.Iterate(
    right => Console.WriteLine(right.ToString()),
    left => Console.WriteLine($"Hello {left}"));

//"Hello World"

One sided approach

You can also use the IterateLeft and IterateRight to produce the same results, but with these methods the action is applied just to one of the possible values.

When the target type is different from Either current value the function will creates an Unit value.

IterateLeft when Either IsRight

Either<string, int> either = 10;
either.IterateLeft(left => Console.WriteLine($"Hello {left}"));
//

IterateLeft when Either IsLeft

Either<string, int> either = " World";
either.IterateLeft(
left => Console.WriteLine($"Hello {left}"));
//"Hello World"