Frontend Interview - собеседования по Javascript / Html / Css
Канал для подготовки к собеседованиям по фронтенду Админ, сотрудничество, реклама: @seniorFrontPromo, @maria_seniorfront Купить рекламу: https://telega.in/c/frontendinterview Канал в реестре РКН: https://rknn.link/su
Show more📈 Analytical overview of Telegram channel Frontend Interview - собеседования по Javascript / Html / Css
Channel Frontend Interview - собеседования по Javascript / Html / Css (@frontendinterview) in the Russian language segment is an active participant. Currently, the community unites 10 747 subscribers, ranking 11 392 in the Technologies & Applications category and 60 311 in the Russia region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 10 747 subscribers.
According to the latest data from 11 July, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -95 over the last 30 days and by -1 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 6.72%. Within the first 24 hours after publication, content typically collects 4.13% reactions from the total number of subscribers.
- Post reach: On average, each post receives 722 views. Within the first day, a publication typically gains 444 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 2.
- Thematic interests: Content is focused on key topics such as javascript, браузер, html, css, видимость.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“Канал для подготовки к собеседованиям по фронтенду
Админ, сотрудничество, реклама: @seniorFrontPromo, @maria_seniorfront
Купить рекламу: https://telega.in/c/frontendinterview
Канал в реестре РКН:
https://rknn.link/su”
Thanks to the high frequency of updates (latest data received on 12 July, 2026), the channel maintains relevance and a high level of publication reach. Analytics show that the audience actively interacts with content, making it an important point of influence in the Technologies & Applications category.
var arr = ["a", "b", "c"]; print(Object.getOwnPropertyNames(arr).sort()); // prints "0,1,2,length"// Array-like object
var obj = { 0: "a", 1: "b", 2: "c"};
print(Object.getOwnPropertyNames(obj).sort()); // prints "0,1,2"
Object.keys() возвращает перечислимые свойства из объекта или массива.
Пример:
var arr = ["a", "b", "c"]; alert(Object.keys(arr)); // will alert "0,1,2"// array like object
var obj = { 0 : "a", 1 : "b", 2 : "c"};
alert(Object.keys(obj)); // will alert "0,1,2"
👉 @frontendInterview <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Title</title>
<script type="text/javascript">
function addNode() {
var newP = document.createElement("p");
var textNode = document.createTextNode(" I'm a new text node");
newP.appendChild(textNode);
document.getElementById("target").appendChild(newP);
}
</script>
</head>
<body onload="addNode();">
<p id="target">sart here<p>
</body>
</html>
👉 @frontendInterview myname = "global";
function func() {
var myname;
console.log(myname); // "undefined"
myname = "local";
console.log(myname); // "local"
}
func();
В консоль будет напечатано:
undefined
local
👉 @frontendInterview isDigit("3")
isDigit(" 3 ")
isDigit("-3.23")
Вернут true
isDigit("3-4")
isDigit(" 3 5")
isDigit("3 5")
isDigit("zero")
Вернут false
👉 @frontendInterview var a = 90100;
function someFunc(){
var a;
var b;
if(false){
a = 1;
} else {
b = 2;
}
console.log(b);
console.log(a); //(1) переменную a переопределили в функции
}
someFunc();
Результат выполнения:
2
undefined
👉 @frontendInterview var arr = [3, 4, 5];
Array.prototype.each = function() {/*some fancy polyfill*/};
for (var i in arr) {
console.log(i);
}
Выведет
0 1 2 eachЧтобы избежать таких проблем, можно воспользоваться методом Object.prototype.hasOwnProperty. Модифицированный пример, который работает корректно:
var arr = [3, 4, 5];
Array.prototype.each = function() {/*some fancy polyfill*/};
for (var i in arr) {
if (arr.hasOwnProperty(i)){
console.log(i);
}
}
👉 @frontendInterview1990 = "MCMXC" (1000 = M, 900 = CM, 90 = XC) 2008 = "MMVIII" (2000 = MM, 8 = VIII).Расшифровка: Symbol Value
I 1
V 5
X 10
L 50
C 100
D 500
M 1,000
👉 @frontendInterview