// 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
function isPandigitalRange(num, start = 1, end = 9) {
const str = String(num);
// Build the expected digit string
const expected = Array.from({ length: end - start + 1 }, (_, i) => String(i + start)).join('');
// Sort digits of the number
const digits = str.split('').sort().join('');
return digits === expected;
}
console.log(isPandigitalRange(123456789)); // true
console.log(isPandigitalRange(1023456789, 0, 9)); // true
console.log(isPandigitalRange(123455789)); // false
/*
run:
true
true
false
*/
