Implicate cast is not working or it is by design

[dominikjeske]

I wonder if some use cases below are errors or maybe it should be like that. Maybe I'm using it wrong but I find it hard to read when I had to cast each time to Result type or give full generic parameters.

class Err
{
    public string Message { get; set; }
}

class Err2
{
    public string Message { get; set; }
}

// Example 1 - Binding to new result type

var result = Result.Success<string, Err>("Success");
//CS0029 Cannot implicitly convert type 'string' to 'System.Threading.Tasks.Task<CSharpFunctionalExtensions.UnitResult<Err>>
var other = result.Bind(x => "");
// This works but I have to create Result explicitly
var other2 = result.Bind(x => Result.Success<string, Err>( ""));

// Example 2 - Compensate to new error type

var fail = Result.Failure<string, Err>(new Err { Message = "mess" });
//CS0029 Cannot implicitly convert type 'Err2' to 'System.Threading.Tasks.Task<CSharpFunctionalExtensions.Result>'
var compensated = fail.Compensate(x => new Err2 { Message = x.Message });
// This works but I have to put generic params expicite
var compensated2 = fail.Compensate<string, Err, Err2>(x => new Err2 { Message = x.Message });

Any suggestions?

[hankovich]

Hi, you can use Map instead of Bind

// Wrong
var other = result.Bind(x => "");

// Correct
var other = result.Map(x => "");

and MapError instead of Compensate

// Wrong
var compensated = fail.Compensate(x => new Err2 { Message = x.Message });

// Correct
var compensated = fail.MapError(x => new Err2 { Message = x.Message });

[dominikjeske]

I can swear I tried Map and it not work but you are right :) And of course MapError also works. I have to work more with this lib to know it better. I think more docs/examples on how all those functions differ between each other would be helpful.