Rainbow text

Text.scala

import Console._

object Text {

  private val colours = List(RED, YELLOW, GREEN, CYAN, BLUE, MAGENTA)
  
  def bonza(string: String): String = GREEN + string + RESET
  
  def alter(string: String): String = RED + string + RESET
  
  def rainbow(string: String): String = {
    val rainbow = Stream.continually(colours.toStream).flatten.take(string.length).toList
    rainbow.zip(string).map { case (colour, character) => colour + character }.mkString("", "", RESET)
  }
  
}