doublemetal / scala-study

study of scala

doublemetal.github.io

This is my web site

scala-study's Issues

underscore 사용법

import scala._    // Wild card -- all of Scala is imported
import scala.{ Predef => _, _ } // Exclusion, everything except Predef
def f[M[_]]       // Higher kinded type parameter
def f(m: M[_])    // Existential type
_ + _             // Anonymous function placeholder parameter
m _               // Eta expansion of method into method value
m(_)              // Partial function application
_ => 5            // Discarded parameter
case _ =>         // Wild card pattern -- matches anything
f(xs: _*)         // Sequence xs is passed as multiple parameters to f(ys: T*)
case Seq(xs @ _*) // Identifier xs is bound to the whole matched sequence

method definition 에서 sign(`=`) 이 있고 없고의 차이점?

코드

package io.doublemetal

object main {
    def main(args: Array[String]) = {
        println("Hello, Scala!!")
    }
}