Add array values if digits does not contain any repeating number

uniqueSum.ts

const uniqueSum = (arr: number[]) => {
  // Filter any number from the array that has repeating digits
  const filterRepeatingDigits = (num: number) => {
    const digits = num.toString().split('');
    return digits.length === new Set(digits).size;
  }

  // Obtain an array of numbers containing only numbers w/ non-repeating digits
  const filtered = arr.filter(filterRepeatingDigits)

  // Use reduce to get the sum. Initial value of 0 is provided in case the filtered array returns empty
  return filtered.reduce((a,b)=> a+b, 0);
}

const arr0 = uniqueSum([1, 2, 3]);              // 6
const arr1 = uniqueSum([11, 22, 33]);           // 0 
const arr2 = uniqueSum([101, 2, 3]);            // 5
const arr3 = uniqueSum([11, 22, 33, 440, 56]);  // 56

console.log(arr0)
console.log(arr1)
console.log(arr2)
console.log(arr3)