LittleTree Implementation

LittleTree.scala

package com.rtfpessoa.scala

import scala.language.postfixOps
import scala.util.Properties

case class LittleTree(height: Int) {

  implicit class IntOps(int: Int) {
    def isOdd = int % 2 > 0
  }

  private def makeTree: String = {
    repeatLine(height) { line =>
      times(height - line - 1)(" ") +
        times(2 * line - 2)("*")
    }
  }

  private def makeTrunk: String = {
    val lastLineWidth = height * 2 - 1

    if (height.isOdd) {
      repeatLine(height / 2) { line =>
        times(lastLineWidth / 4 - 1)(" ") +
          times(lastLineWidth / 2)("#")
      }
    } else {
      repeatLine(height / 2) { line =>
        times(lastLineWidth / 4)(" ") +
          times(lastLineWidth / 2 - 1)("x")
      }
    }
  }

  private def repeatLine(limit: Int)(body: Int => String): String = {
    0 to limit map body mkString Properties.lineSeparator
  }

  private def times(limit: Int)(body: => String): String = {
    0 to limit map (_ => body) mkString
  }

  override def toString: String = {
    Seq(makeTree, makeTrunk) mkString Properties.lineSeparator
  }

}