Question

How to find the highest digit in int number with JavaScript

Answer 1

function getTheHighestDigit(n) {
    let max = 0;
    while(n) {
        if (n % 10 > max) max = n % 10;
        n = parseInt(n / 10)
    }
    return max;
}
  
let n = 213;
console.log(getTheHighestDigit(n));
        
n = 76594;
console.log(getTheHighestDigit(n));
        
n = 76852;
console.log(getTheHighestDigit(n));
 
 
 
 
/*
run:
 
3
9
8
 
*/

 

70+ SQL courses for beginners and professionals

Answer 2

function getTheHighestDigit(n) {
  if(n == 0) { return 0;}
  else {
    var remainder = n % 10
    return Math.max(remainder, getTheHighestDigit((n - remainder) * 1e-1));
  }
}
  
let n = 213;
console.log(getTheHighestDigit(n));
        
n = 76594;
console.log(getTheHighestDigit(n));
        
n = 76852;
console.log(getTheHighestDigit(n));
 
 
 
 
/*
run:
 
3
9
8
 
*/

 

70+ SQL courses for beginners and professionals

Answer 3

function getTheHighestDigit(n) {
  if(n == 0) { return 0;}
  else {
    var remainder = n % 10
    return Math.max(n % 10, getTheHighestDigit(Math.floor(n / 10)));
  }
}
  
let n = 213;
console.log(getTheHighestDigit(n));
        
n = 76594;
console.log(getTheHighestDigit(n));
        
n = 76852;
console.log(getTheHighestDigit(n));
 
 
 
 
/*
run:
 
3
9
8
 
*/

 

70+ SQL courses for beginners and professionals