Алексей Уколов

var b;
start(343910101)
.then(res => {b = res})
.then(() => console.log(b));

each val, index in ["Journal", "About", "Work", "Contact"]
  - var class = 'main-nav__item';
  - class += index === 0 ? ' special' : ''
  a(href="/", class="#{class}")= val

document.querySelector('#id1').querySelector('#id2')

$ar = [];

$query = $mysqli->query("SELECT nom, price FROM kurs_bufer");

while ($row = $query->fetch_array()) {
  $ar[$row['nom']] = $row['price'];
}

var count = 3,
    iteration = 0,
    intervalId ;

intervalId = setInterval(function() {
    iteration++;

    if (iteration > count) {
        return clearInterval(intervalId );
    }

    alert(count);
}, 100);

array array_diff ( array $array1 , array $array2 [, array $... ] )
Compares array1 against one or more other arrays and returns the values in array1 that are not present in any of the other arrays.