ThunderCat

const elems = [...document.querySelectorAll('.class1')];
const index = elems.findIndex(n => n.classList.contains('class2'));

const elems = document.querySelectorAll('.class1');
let index = elems.length;
while (--index >= 0 && !elems[index].matches('.class2')) ;

const index = Array.prototype.indexOf.call(
  document.querySelectorAll('.class1'),
  document.querySelector('.class2')
);

$arr1 = array("apple", "orange",);
$arr2 = array("apple", "lime", "lime", "apple", "tomato", "tomato");

print_r(array_intersect($arr2, $arr1));

const data = $('table tr')
  .get()
  .map(tr => $('input', tr).get().map(n => $(n).val()))
  .filter(row => row[row.length - 1])
  .map(row => `(${row.map(n => `'${n}'`).join(', ')})`);

$('input').on('input', function() {
  $(this).val((i, v) => Math.max(this.min, Math.min(this.max, v)));
});

document.querySelector('input').addEventListener('input', ({ target: t }) => {
  t.value = Math.max(t.min, Math.min(t.max, t.value));
});

<script>
    $( "div.foo" ).click(function() {
</script>