monads

Monads.kt

var sum4 : (Int) -> Int = { value -> value + 4 }
var div2 : (Int) -> Int = { value -> value / 2 }

MonadUsage.kt

sum4(4) //return 8
div2(4) //return 2

listOf(3,4,6,8,10)
        .map(sum4)
        .map(div2)
//[3, 4, 5, 6, 7]

fun hello(name: String, textDecorator: () -> String): String {
    return "hello $name ${textDecorator()}"
}

hello("marc") {
    "you are awesome!"      
}

// es lo mismo que 
hello("marc", {"you are awesome"})

//hello marc You are awesome!