Question

How to check if specific digit exists in a number with JavaScript

Answer 1

function check_digit_exists(n, digit) {
    while (n > 0) {
        if (digit == n % 10) {
            return true;
        }
        n = parseInt(n / 10);
    }
    return false;
}

        
const num = 230168;

console.log(check_digit_exists(num, 1));
console.log(check_digit_exists(num, 5));




/*
run:

true
false

*/

 

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Answer 2

const num = 230168;

const str = num.toString();
         
const digit_exists = (str.indexOf('1') != -1) ? "yes" : "no";
console.log(digit_exists);
 
console.log((str.indexOf('5') != -1) ? "yes" : "no");




/*
run:

"yes"
"no"

*/

 

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