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Ejemplo de If en Scala. Notar la primera condición
def validar(tam:Int, accion:String) : Option[Array[Int]] =
if (accion.exists(!_.isDigit))
None
else {
val num = accion.map(_.toInt - '0'.toInt).distinct
if (num.length == tam && num.length == accion.length)
Some(num.toArray)
else
None
}
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