Implicit Parameters

object Main {
  def greet(name: String)(implicit greeting: String): String =
    s"$greeting, $name!"
  implicit val defaultGreeting: String = "Hello"
  def main(args: Array[String]): Unit = {
    println(greet("Ann"))
  }
}

object Main {
  def multiply(x: Int)(implicit factor: Int): Int = x * factor
  implicit val f: Int = 10
  def main(args: Array[String]): Unit = {
    println(multiply(5))
  }
}

object Main {
  def multiply(x: Int)(implicit factor: Int): Int = x * factor
  implicit val f: Int = 10
  def main(args: Array[String]): Unit = {
    println(multiply(5))
    println(multiply(5)(2))
  }
}

object Main {
  case class Config(env: String)
  def run()(implicit cfg: Config): String = s"running in ${cfg.env}"
  implicit val cfg: Config = Config("prod")
  def main(args: Array[String]): Unit = {
    println(run())
  }
}

object Main {
  implicit val name: String = "Scala"
  def main(args: Array[String]): Unit = {
    val n = implicitly[String]
    println(n)
  }
}

object Main {
  def max[T: Ordering](a: T, b: T): T = {
    val ord = implicitly[Ordering[T]]
    if (ord.gt(a, b)) a else b
  }
  def main(args: Array[String]): Unit = {
    println(max(3, 7))
    println(max("apple", "pear"))
  }
}

object Main {
  case class User(name: String)
  def log(msg: String)(implicit u: User): Unit =
    println(s"[${u.name}] $msg")
  def doWork()(implicit u: User): Unit = {
    log("started")
    log("finished")
  }
  implicit val current: User = User("admin")
  def main(args: Array[String]): Unit = {
    doWork()
  }
}

object Main {
  case class Currency(symbol: String)
  object Currency {
    implicit val default: Currency = Currency("$")
  }
  def price(amount: Int)(implicit c: Currency): String = s"${c.symbol}$amount"
  def main(args: Array[String]): Unit = {
    println(price(50))
  }
}

object Main {
  def label(x: Int)(implicit unit: String): String = s"$x$unit"
  implicit val unit: String = "px"
  def main(args: Array[String]): Unit = {
    // Only one implicit String in scope -> no ambiguity
    println(label(12))
  }
}

object Main {
  def format(n: Double)(implicit decimals: Int): String =
    f"$n%.${decimals}f"
  implicit val d: Int = 2
  def main(args: Array[String]): Unit = {
    println(format(3.14159))
    println(format(3.14159)(4))
  }
}

object Main {
  case class Locale(code: String)
  def hello()(implicit loc: Locale): String =
    if (loc.code == "tr") "Merhaba" else "Hello"
  implicit val loc: Locale = Locale("tr")
  def main(args: Array[String]): Unit = {
    println(hello())
  }
}