kotlin : what is difference between isNullOrEmpty and isNullOrBlank?

isNullOrBlank() takes whitespace into account:

fun main() {
  val thisIsBlank = "   "

  println(thisIsBlank.isNullOrEmpty())
  println(thisIsBlank.isNullOrBlank())
}

This prints:

false
true

because thisIsBlank is not empty, but it is blank.