Centaur

trait CanFromString[T] {
  def fromString(s: String): T
}

implicit object intCanFromString extends CanFromString[Int] {
  override def fromString(s: String): Int = s.toInt
}
implicit object SymbolCanFromString extends CanFromString[Symbol] {
  override def fromString(s: String): Symbol = Symbol(s)
}

doitian

package module.db;

import com.mongodb.casbah.Imports._
import java.text.DateFormat
import java.util.Date
import play.api.data.validation.ValidationError
import play.api.libs.json._

object MongoJson {
  def fromJson(json: JsValue) : JsResult[DBObject] = readDBObject.reads(json)

notyy

def myFunc() = {
  val rs = calcSomeResult()
  logger.info("result is:" + rs)
  rs
}
为避免上面的麻烦写法:

object LogUtil {
  def kestrel[A](x: A)(f: A => Unit): A = { f(x); x }
  def logV[A](f: String => Unit)(s: String, x: A) = kestrel(x) { y => f(s + ": " + y) }