Home how to create a function that takes ANY number and finds the LARGEST number formed by consecutive digits in that number

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how to create a function that takes ANY number and finds the LARGEST number formed by consecutive digits in that number

byMR

December 13, 2021

how to create a function that takes ANY number and finds the LARGEST number formed by consecutive digits in that number in Javascript ?

example:
input: 90123609789
output: 90123

input: 53590 output 90
input:674030098567819 output: 5678

>Solution :

You can try all substrings where the difference between adjacent digits is 1 under modulus 10.

function largestConsecutiveDigits(n) {
  let str = String(n),
    res = Math.max(...str);
  for (let i = 0; i < str.length; i++) {
    for (let j = i + 1; j < str.length; j++) {
      if ((str[j] - str[j - 1] + 10) % 10 === 1) 
        res = Math.max(res, str.slice(i, j + 1));
      else break;
    }
  }
  return res;
}
console.log(largestConsecutiveDigits('90123609789'));
console.log(largestConsecutiveDigits('53590'));