Mapping EDSL for Either

[lukashaertel]

I've been doing some experiments with Either myself and what I came up with has IMO a nice way of mapping either choice in a concise fashion, you might want to take a look at it and see if this is something for funktionale-either. It appears to be what Either is doing in fold but expanded by infix operations.

Relevant code starts here: https://gist.github.com/lukashaertel/02b8dd4a5ad8c691bc783eb7b88fba9b#file-choice-kt-L37

And here's an example of how it's applied:

    // A method handling that choice type
    val f = { u: Choice<Number, String> ->
        // Map either side accordingly
        val d = u onLeft {
            it.toDouble() / 2
        } onRight {
            it.length.toDouble()
        }

        println(d)
    }

[MarioAriasC]

I'll have a look, sorry for the late response