isblank.scala

import java.lang.Character.{isWhitespace, charCount}

implicit class SuperString(str: String) extends AnyVal {
  def isBlank: Boolean = {
    @tailrec def check(index: Int): Boolean =
      if (index >= str.length) true
      else {
        val cp = str.codePointAt(index)
        if (isWhitespace(cp)) check(index + charCount(cp)) else false
      }

    check(0)
  }
}