Question

How to check if a number is pandigital in Scala

Answer 1

// A pandigital number is an integer that contains each digit from 0 to 9 
// at least once, with the condition that the leading digit must be nonzero

// for example, 1023456987 is a pandigital number 

object PandigitalCheck {

  def isPandigitalRange(num: Long, start: Int = 1, end: Int = 9): Boolean = {
    val str = num.toString

    // Build the expected digit string
    val expected = (start to end).map(_.toString).mkString

    // Sort digits of the number
    val sorted = str.sorted

    sorted == expected
  }

  def main(args: Array[String]): Unit = {
    println(isPandigitalRange(123456789))          
    println(isPandigitalRange(1023456789, 0, 9))   
    println(isPandigitalRange(987654321))          
    println(isPandigitalRange(123456780))          
    println(isPandigitalRange(123456780))          
    println(isPandigitalRange(123455789))          
    println(isPandigitalRange(12345))              
  }
}




/*
run:

true
true
true
false
false
false
false

*/

 

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