What is the output?
Anonymous Quiz
50%
2
28%
1
12%
ReferenceError: users is not defined
10%
TypeError: activeUsers.has is not a function
🔥1
A vanilla JS library for making on-page tours and contextual help systems. It’s been around for several years, but is still maintained, and there are lots of examples to check out – it’s really smooth.
Kamran Ahmed
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👍3❤2🔥2
CHALLENGE
function mystery() {
try {
console.log('A');
throw new Error('Oops');
console.log('B');
} catch (err) {
console.log('C');
return 'D';
} finally {
console.log('E');
return 'F';
}
console.log('G');
return 'H';
}
console.log(mystery());❤5
🤣6👍3❤2🤔2
The Ultimate Guide to Understanding EventLoop in Node.js
This comprehensive guide is going to take some time to cover every detail that you need to know, so grab a cup of coffee and settle in for an exciting journey to the fascinating world of Node.js. Let’s get started!
nairihar
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❤8👍2🔥2
CHALLENGE
const compose = (...fns) => x => fns.reduceRight((acc, fn) => fn(acc), x);
const addTwo = num => num + 2;
const multiplyByThree = num => num * 3;
const subtractTen = num => num - 10;
const calculate = compose(subtractTen, multiplyByThree, addTwo);
console.log(calculate(5));
❤5🔥3👍1
What is the output?
Anonymous Quiz
10%
7
44%
11
37%
((5 + 2) * 3) - 10 = 11
9%
(5 + 2) * 3 - 10 = 11
❤4🤔3👍2
From Chrome 137 you can try out CSS inline conditionals with the if() function. if() enables a cleaner developer interface for dynamic styles like style queries and media queries, with some key differences, which you can learn about in this post.
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❤10👍3🔥2
CHALLENGE
function Vehicle(wheels) {
this.wheels = wheels;
}
Vehicle.prototype.getWheels = function() {
return this.wheels;
};
function Car() {
Vehicle.call(this, 4);
this.doors = 4;
}
Car.prototype = Object.create(Vehicle.prototype);
Car.prototype.constructor = Car;
const myCar = new Car();
console.log(myCar.getWheels(), myCar instanceof Vehicle);❤4
What is the output?
Anonymous Quiz
19%
4 false
46%
4 true
29%
TypeError: myCar.getWheels is not a function
6%
undefined true
❤4🔥3🤔3👍1
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❤5🔥3👍2
CHALLENGE
function getOrder() {
console.log('1');
setTimeout(() => console.log('2'), 0);
Promise.resolve().then(() => {
console.log('3');
Promise.resolve().then(() => console.log('4'));
});
Promise.resolve().then(() => console.log('5'));
console.log('6');
}
getOrder();❤3
👍7❤4🔥3
The Oxidation Compiler is creating a collection of high-performance tools for JavaScript and TypeScript.
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❤5🤔2👍1🔥1
CHALLENGE
const scores = [85, 92, 78, 90];
const student = {
name: 'Jordan',
grade: 'A',
...{ courses: ['Math', 'Science'] },
scores,
average: function() { return this.scores.reduce((a, b) => a + b) / this.scores.length }
};
const { name, ...details } = student;
const [first, ...rest] = scores;
console.log(details.scores[0], rest[0]);
❤4🔥1
🔥3👍2❤1🤔1
CHALLENGE
function* createCounter() {
let count = 0;
while (true) {
const reset = yield ++count;
if (reset) {
count = 0;
}
}
}
const counter = createCounter();
console.log(counter.next().value);
console.log(counter.next().value);
console.log(counter.next(true).value);
console.log(counter.next().value);❤9👍1
👍3
CHALLENGE
function createCounter() {
let count = 0;
const counter = {
increment() {
count++;
return count;
},
getCount() {
return count;
}
};
return counter;
}
let c1 = createCounter();
c1.increment();
c1.increment();
let c2 = c1;
c1 = null;
console.log(c2.getCount());❤3👍1
What is the output?
Anonymous Quiz
22%
null
27%
undefined
20%
ReferenceError: count is not defined
31%
2
👍5🤔5❤1