0xD34F

const text = [
  'hello, world!!',
  'fuck the world',
  'fuck everything',
];

$('table').on('click', 'td', function() {
  const $this = $(this);
  const index = (+$this.data('index') + 1) % text.length;

  $this.text(text[index]).data('index', index);
}).find('td').data('index', -1);

echo preg_replace("/\b(\w{6})\b/ui", "$1*", $text);

SELECT *
FROM foo
WHERE date BETWEEN DATE_SUB(NOW(), INTERVAL 1 HOUR) AND NOW()

SELECT
    question_id,
    SUM(points <  1) AS 'Incorrect',
    SUM(points >= 1) AS 'Correct'
FROM
    `cp_question_student`
GROUP BY
    question_id

function removeWords($str, $n) {
  return implode(' ', array_slice(explode(' ', $str), 0, $n - 1));
}

echo removeWords("Бухгалтерский учет и анализ слонов", 3);

function createTree(data, levelKey, childrenKey) {
  const tree = [];

  data.forEach(n => {
    let arr = tree;

    for (let level = 0; n[levelKey] > level++;) {
      arr = arr[arr.length - 1][childrenKey];
    }

    arr.push(Object.assign({ [childrenKey]: [] }, n));
  });

  return tree;
}


const tree = createTree([
  { id: 1, title: 'test1', level: 0 },
  { id: 2, title: 'test2', level: 1 },
  { id: 3, title: 'test3', level: 2 },
  { id: 4, title: 'test4', level: 1 },
  { id: 5, title: 'test5', level: 0 },
], 'level', 'nodes');

$('.calculator_price')
  .find('.calculator_price__item:lt(6)')
  .css('display', 'flex');

$('.calculator_price .calculator_price__item')
  .filter((i, n) => $(n).index() < 6)
  .css('display', 'flex');

document.querySelectorAll('.calculator_price').forEach(n => {
  [...n.querySelectorAll('.calculator_price__item')]
    .slice(0, 6)
    .forEach(n => n.style.display = 'flex');
});

<div id="inputs">
  <input maxlength="5">
</div>

const $inputs = $('#inputs').on('input', 'input', function() {
  const $this = $(this);
  const maxlen = +$this.attr('maxlength');

  if ($this.val().length === maxlen) {
    let $next = $this.next();
    if (!$next.length) {
      $next = $(`<input maxlength="${maxlen}">`).appendTo($inputs);
    }

    $next.focus();
  }
});

// или

document.querySelector('#inputs').addEventListener('input', function(e) {
  const input = e.target;
  const maxlen = +input.getAttribute('maxlength');

  if (input.value.length === maxlen) {
    if (!input.nextElementSibling) {
      this.insertAdjacentHTML('beforeend', `<input maxlength="${maxlen}">`);
    }

    input.nextElementSibling.focus();
  }
});

.class2:hover + .class3 {
  color: red;
}

props: [ 'post' ],
created() {
  console.log(this.post);
},