javascript - Best way to check if a number contains another number

Question

For example if the number 752 contains the number 5? Whats the best way to check? Convert to string or divide into individual digits?

Answer 1

Convert to string and use indexOf

(752+'').indexOf('5') > -1

console.log((752+'').indexOf('5') > -1);
console.log((752+'').indexOf('9') > -1);