object DigitCounter {
/**
* Counts how many times each digit (0–9) appears in a given number.
*
* @param number The input number (Long or Int)
* @return A Map[Int, Int] where key = digit, value = frequency
*/
def digitFrequency(number: Long): Map[Int, Int] = {
// Convert number to string so we can iterate over each character
val digits = number.toString
// Initialize a map with digits 0–9 all starting at frequency 0
val initialFreq = (0 to 9).map(d => d -> 0).toMap
// Fold over the digits, updating the frequency map
digits.foldLeft(initialFreq) { (freqMap, ch) =>
val digit = ch.asDigit
freqMap.updated(digit, freqMap(digit) + 1)
}
}
def main(args: Array[String]): Unit = {
val number = 120220340501L
// Call the function
val freq = digitFrequency(number)
// Print the result (this line is valid)
println(freq)
}
}
/*
run:
HashMap(0 -> 4, 5 -> 1, 1 -> 2, 6 -> 0, 9 -> 0, 2 -> 3, 7 -> 0, 3 -> 1, 8 -> 0, 4 -> 1)
*/
