Monad?

gistfile1.js

function colorScheme(r, g, b){

    return function(callback){
        return callback(r, g, b)
    }

}

function darken(darken_by){
    return function(r, g, b){
        return colorScheme(r - darken_by, g - darken_by, b - darken_by)
    }
}


var MyColor = colorScheme(50, 50, 100)

var Darker = MyColor(darken(10))

Darker(function(r, g, b){ console.log(r, g, b) })