val vs. lazy val for implicit class's in Scala

val-vs-lazy-val.scala

implicit class StringOps(s: String) {
  
  val one = { println("one"); "one" }
  val two = { println("two"); "two" }
  lazy val three = { println("three"); "value" }

}

scala> "asdf".three
one
two
three
res1: String = value

scala> "asdf".two
one
two
res2: String = two