Question

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

Answer 1

function check_digit_exists(n: number, digit: number) {
    while (n > 0) {
        if (digit == n % 10) {
            return true;
        }
        n = Math.floor(n / 10);
    }
    return false;
}
 
         
const num: number = 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: number = 230168;
 
const str: string = num.toString();
          
const digit_exists: string = (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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