Printing only numbers with non-repeating digits

	/**
	Print From 45 to 4578 Without Repeating Digits
	Write a method that prints all the numbers from 45 to 4578 to the console,
	with the constraint that you cannot print any number with repeating digits.
	This means the following numbers would be skipped:
	11, 22, ...., 122, 110,....
	**/
	package puzzlers
	object NumberPrinter {
	def nonRepeatingDigitNumbers(start:Int, end:Int): IndexedSeq[Int] = {
	(start to end).filterNot(x => x.toString.toCharArray().groupBy(identity).exists(_._2.size > 1))
	}
	def main(args: Array[String]): Unit = {
	for (number <- nonRepeatingDigitNumbers(45, 4578)) {
	println(number)
	}
	}
	}

view raw gistfile1.scala hosted with ❤ by GitHub