generatorliczb.pl: Blacklisting certain strings

const button_ccvar = document.getElementsByClassName('block generate-numbers')[0];
const result_tbvar = document.getElementById('result-numbers');
const blacklisted_strings = ['21', '24']

function changeText(text) {
  if (blacklisted_strings.includes(result_tbvar.textContent)) {
    result_tbvar.textContent = text;
  }
}

button_ccvar.addEventListener('click', () => changeText(document.getElementById('to').value));