Javascript common substring

common_substring.js

function commonSubstring(a, b) {
  a.forEach((row, index) => {
    const otherString = b[index] ?? '';
    if(row.split('').some((letter) => otherString.indexOf(letter) !== -1)) {
      console.log('YES');
    }else{
      console.log('NO');
    }
  })
}