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👍5🔥3❤2
CHALLENGE
console.log('Start');
setTimeout(() => {
console.log('Timeout 1');
}, 0);
Promise.resolve().then(() => {
console.log('Promise 1');
}).then(() => {
console.log('Promise 2');
});
setTimeout(() => {
console.log('Timeout 2');
}, 0);
console.log('End');❤4
This ~420pg ebook is a collection of all 4 remaining "unbooks" of the 2nd edition of "You Don't Know JS Yet" book series.
Kyle Simpson
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1👍10❤4🔥4🤔1
CHALLENGE
const a = 9007199254740991n;
const b = 2n;
function performCalculation() {
const c = a + 1n;
const d = c / b;
const e = d * 2n - 1n;
const result = Number(e) === Number(a);
console.log(result);
}
performCalculation();
👍7
What is the output?
Anonymous Quiz
31%
true
24%
false
20%
9007199254740991
26%
TypeError: Cannot convert a BigInt value to a number
👍11🤔6❤4
CHALLENGE
const obj = {
[Symbol('a')]: 'hidden',
a: 'visible',
[Symbol.for('b')]: 'registered',
b: 123
};
const symbol1 = Symbol.for('b');
const symbol2 = Symbol.for('b');
console.log(obj.a + ', ' +
obj[Symbol('a')] + ', ' +
obj[symbol1] + ', ' +
(symbol1 === symbol2));
❤2🔥2👍1
What is the output?
Anonymous Quiz
38%
visible, hidden, registered, true
38%
visible, undefined, registered, true
14%
visible, undefined, registered, false
10%
visible, hidden, undefined, true
👍7❤5🔥4
A popular Processing-inspired creative coding library that makes it easy to create interactive, visual experiences (examples). v2.0 improves its font support, adds more ways to draw and manipulate text, adds a way to write shaders in JavaScript, and much more. p5.js 2.0: You Are Here has more details on the release and where the project is headed next.
p5.js Team
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👍7🔥2❤1
CHALLENGE
function* counter() {
let i = 0;
while (true) {
const direction = yield i;
if (direction === 'up') i += 2;
else if (direction === 'down') i -= 1;
else i += 1;
}
}
const count = counter();
console.log(count.next().value);
console.log(count.next('up').value);
console.log(count.next('down').value);
console.log(count.next().value);👍1🔥1
👍4❤3🔥3
A split-flap display is a electro-mechanical display commonly associated with live timetable displays and it makes for a neat effect on the Web too. Jhey breaks down how to replicate it, or you can hit up this live demo.
Jhey Tompkins
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CHALLENGE
function* genSequence() {
const result = yield 'first';
console.log(result);
yield* [1, 2];
return 'done';
}
const gen = genSequence();
let next = gen.next('ignored');
console.log(next.value);
next = gen.next('second');
next = gen.next();
console.log(next.value);
next = gen.next();
console.log(next);👍3❤2🔥1
A surprisingly featureful control for letting users pick fonts from a range of system fonts, Google fonts, and custom fonts of your choice. You can play with a code demo here or go to the GitHub repo.
Zygomatic
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❤3👍2🔥1
CHALLENGE
function Animal(name) {
this.name = name;
}
Animal.prototype.getName = function() {
return this.name;
};
function Dog(name, breed) {
Animal.call(this, name);
this.breed = breed;
}
Dog.prototype = Object.create(Animal.prototype);
Dog.prototype.constructor = Dog;
Dog.prototype.getName = function() {
return `Dog called ${Animal.prototype.getName.call(this)}`;
};
const myDog = new Dog('Rex', 'German Shepherd');
console.log(myDog.getName());🔥5❤1👍1
🔥4❤1👍1
Koa first appeared over a decade ago as a ‘next-generation’ Web framework that shared some of the lineage (and team) of Express.js, but leaning on more modern JavaScript features and ideas of the time. While Express has been making a comeback recently, Koa has progressed too and offers a compelling alternative. v3.0 release notes.
Koa contributors
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❤7🤩2👍1🔥1
CHALLENGE
const obj = {
value: 42,
getValue() {
return this.value;
},
getValueArrow: () => this.value,
nested: {
value: 100,
getValue() {
return this.value;
}
}
};
const extractedMethod = obj.getValue;
const boundMethod = obj.getValue.bind(obj);
console.log(obj.getValue() + ',' + obj.getValueArrow() + ',' +
obj.nested.getValue() + ',' + extractedMethod() + ',' +
boundMethod());❤2
What is the output?
Anonymous Quiz
33%
42,42,100,42,42
28%
42,undefined,100,42,42
16%
undefined,undefined,100,undefined,42
22%
42,undefined,100,undefined,42
👍3❤2🔥2