JavaScript test
Проверка своих знаний по языку JavaScript. Ссылка: @Portal_v_IT Сотрудничество: @oleginc, @tatiana_inc Канал на бирже: telega.in/c/js_test РКН: clck.ru/3KHeYk
Show more📈 Analytical overview of Telegram channel JavaScript test
Channel JavaScript test (@js_test) in the Russian language segment is an active participant. Currently, the community unites 10 105 subscribers, ranking 12 203 in the Technologies & Applications category and 65 059 in the Russia region.
📊 Audience metrics and dynamics
Since its creation on невідомо, the project has demonstrated rapid growth, gathering an audience of 10 105 subscribers.
According to the latest data from 05 June, 2026, the channel demonstrates stable activity. Although there has been a change in the number of participants by -99 over the last 30 days and by -4 over the last 24 hours, overall reach remains high.
- Verification status: Not verified
- Engagement rate (ER): The average audience engagement rate is 3.72%. Within the first 24 hours after publication, content typically collects 2.18% reactions from the total number of subscribers.
- Post reach: On average, each post receives 376 views. Within the first day, a publication typically gains 220 views.
- Reactions and interaction: The audience actively supports content: the average number of reactions per post is 0.
- Thematic interests: Content is focused on key topics such as javascript, выходе, console.log(gen.next().value, async, createcounter.
📝 Description and content policy
The author describes the resource as a platform for expressing subjective opinions:
“Проверка своих знаний по языку JavaScript.
Ссылка: @Portal_v_IT
Сотрудничество: @oleginc, @tatiana_inc
Канал на бирже: telega.in/c/js_test
РКН: clck.ru/3KHeYk”
Thanks to the high frequency of updates (latest data received on 06 June, 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.
const original = {
name: 'Sarah',
scores: [85, 92, 78],
details: {
age: 25,
city: 'Portland'
}
};
const copy1 = { ...original };
const copy2 = JSON.parse(JSON.stringify(original));
copy1.name = 'Emma';
copy1.scores.push(95);
copy1.details.age = 30;
console.log(original.name, original.scores.length, original.details.age);
Ответ: Sarah 4 30
JavaScript test | #JavaScript & Max
class StateMachine {
constructor() {
this.state = 'idle';
this.transitions = {
idle: { start: 'running' },
running: { pause: 'paused', stop: 'idle' },
paused: { resume: 'running', stop: 'idle' }
};
}
transition(action) {
const validTransitions = this.transitions[this.state];
if (validTransitions && validTransitions[action]) {
this.state = validTransitions[action];
return true;
}
return false;
}
}
const machine = new StateMachine();
console.log(machine.transition('pause'));
console.log(machine.state);
console.log(machine.transition('start'));
console.log(machine.state);
Ответ: false idle true running
JavaScript test | #JavaScript & Max
var str="abcde";
for (var i=0;i<str.length;i++){
console.log(str.charAt(i),str.charCodeAt(i));
}
Ответ:
a 97
b 98
c 99
d 100
e 101
JavaScript test | #JavaScript & Max
const numbers = [1, 2, 3];
numbers.push(4);
console.log(numbers);
Ответ: [1, 2, 3, 4]
JavaScript test | #JavaScript & Max
console.log('1');
setTimeout(() => console.log('2'), 0);
Promise.resolve().then(() => console.log('3'));
setTimeout(() => console.log('4'), 0);
Promise.resolve().then(() => {
console.log('5');
return Promise.resolve();
}).then(() => console.log('6'));
console.log('7');
Ответ:
1 7 3 5 6 2 4
JavaScript test | #JavaScript & Max
const sym1 = Symbol("id");
const sym2 = Symbol("id");
console.log(sym1 === sym2);
Ответ: false
JavaScript test | #JavaScript & Max
var str="My name is John";
var words1=str.split(" ",3);
console.log("words1:",words1);
var words2=str.split(" ",5);
console.log("words2:",words2);
Ответ:
words1:[ 'My', 'name', 'is' ]
words2:[ 'My', 'name', 'is', 'John' ]
JavaScript test | #JavaScript & Max
const firstArrayData = [ 'JavaScript', 'Universe' ];
const secondArrayData = [ 'JavaScript', 'Universe' ];
console.log(firstArrayData == secondArrayData);
console.log(firstArrayData === secondArrayData);
Ответ: false, false
JavaScript test | #JavaScript & MaxПосмотреть подборкуВнутри: ИИ для работы и бизнеса, IT-контент для любого уровня от джуна до сеньора, а также глубокая аналитика по ИБ и анонимности. Подписывайтесь на самые крутые Tech-каналы в один клик!
setTimeout(() => console.log('Timeout 1'), 100);
setTimeout(() => {
console.log('Timeout 2');
Promise.resolve().then(() => console.log('Promise in Timeout 2'));
}, 50);
Promise.resolve().then(() => console.log('Promise 1'));
setTimeout(() => console.log('Timeout 3'), 150);
console.log('Sync');
Ответ: Sync, Promise 1, Timeout 2, Promise in Timeout 2, Timeout 1, Timeout 3
JavaScript test | #JavaScript & Max
const numbers = [1, 2, 3, 4, 5];
const result = numbers
.map(x => x * 2)
.filter(x => x > 5)
.reduce((acc, x) => {
acc.push(x.toString());
return acc;
}, [])
.map(x => x + '!')
.join(' | ');
console.log(result);
console.log(typeof result);
Ответ: 6! | 8! | 10! string
JavaScript test | #JavaScript & Max
const user = {
name: 'Sarah',
age: 25,
getName() { return this.name; },
getAge: () => this.age
};
const methods = {
regular: user.getName,
arrow: user.getAge
};
console.log(methods.regular());
console.log(methods.arrow());
console.log(user.getName());
console.log(user.getAge());
Ответ: undefined undefined Sarah undefined
JavaScript test | #JavaScript & Max
const firstArrayData = [ 'JavaScript', 'Universe' ];
const secondArrayData = [ 'JavaScript', 'Universe' ];
console.log(firstArrayData == secondArrayData);
console.log(firstArrayData === secondArrayData);
Ответ: false, false
JavaScript test | #JavaScript & Max
function createCounter() {
let count = 0;
return {
increment: () => ++count,
decrement: () => --count,
get: () => count
};
}
const counter1 = createCounter();
const counter2 = createCounter();
counter1.increment();
counter1.increment();
counter2.increment();
console.log(counter1.get(), counter2.get());
const { increment, get } = counter1;
increment();
console.log(get());
Ответ:
2 1 3
JavaScript test | #JavaScript & Max
function processData(data) {
try {
if (!data) {
throw new TypeError('Data is missing');
}
const result = data.process();
return result;
} catch (error) {
console.log(error instanceof ReferenceError ? 1 :
error instanceof TypeError ? 2 :
error instanceof SyntaxError ? 3 : 4);
}
}
processData(null);
Ответ: 2
JavaScript test | #JavaScript & Max
const obj = { a: 1, b: 2 };
const proxy = new Proxy(obj, {
get(target, prop) {
return prop in target ? target[prop] : 0;
}
});
console.log(proxy.a, proxy.b, proxy.c);
Ответ: 1, 2, 0
JavaScript test | #JavaScript & Max
function createCounter() {
let count = 0;
return {
increment() {
count++;
return count;
},
getCount() {
return count;
}
};
}
const counter = createCounter();
console.log(counter.increment());
console.log(counter.getCount());
console.log(counter.increment());
console.log(counter.getCount());
Ответ: 1, 1, 2, 2
JavaScript test | #JavaScript & Max
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