Question

How to find the frequency of each digit (0–9) in a number with TypeScript

Answer 1

function digitFrequencyObj(n: number): Record<number, number> {
  const freq: Record<number, number> = {};

  for (let i = 0; i <= 9; i++) freq[i] = 0;

  for (const ch of n.toString()) {
    freq[Number(ch)]++;
  }

  return freq;
}

console.log(digitFrequencyObj(120220340501));


/*
run:

{
  '0': 4,
  '1': 2,
  '2': 3,
  '3': 1,
  '4': 1,
  '5': 1,
  '6': 0,
  '7': 0,
  '8': 0,
  '9': 0
}

*/

 

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