найти последний div
const last = document.querySelector('#container').lastElementChild;остальные удалить
Array.prototype.reduceRight.call(
document.getElementById('container').children,
(_, n) => n?.nextElementSibling && n.replaceWith(),
null
);const last = Array
.from(document.querySelectorAll('[id="container"] > *'))
.reduce((_, n, i, a) => i === ~-a.length ? n : n.remove(), null);
const resultDiv = document.createElement('div')
document.body.appendChild(resultDiv);
setInterval(() => {
const count = document.querySelectorAll('div').length;
resultDiv.innerText = count;
}, 500)
arr = [[11,22], [33,44]]
console.log ( arr.flat() )
const key = 'workplace';
const values = [ 'office', 'hotel' ];const result = arr.filter(function(n) {
return this.has(n[key]);
}, new Set(values));
// или
const result = values.flatMap(((grouped, n) => grouped[n] ?? []).bind(
null,
arr.reduce((acc, n) => ((acc[n[key]] = acc[n[key]] ?? []).push(n), acc), {})
));
// или
const result = [];
for (const n of arr) {
for (const m of values) {
if (m === n[key]) {
result.push(n);
break;
}
}
}
// или
const result = [];
for (let i = 0; i < arr.length; i++) {
if (~values.indexOf(arr[i][key])) {
result[result.length] = arr[i];
}
}
// или
const result = (function get(i, n = arr[i]) {
return n
? [].concat(values.includes(n[key]) ? n : [], get(-~i))
: [];
})(0);
var members = API.friends.get({
"count": 5000,
"fields": "photo_max",
"offset": 0,
"v": 5.103
}).items;
members = members + API.friends.get({
"count": 5000,
"fields": "photo_max",
"offset": 5000,
"v": 5.103
}).items;
return members;
var min = 100, max = 1000;
return max-API.apps.getRandomInt({max:max-min+1});
