What is the output?
Anonymous Quiz
26%
1, undefined
57%
1, 2
8%
undefined, 1
8%
undefined, undefined
🤣19🤔9🤩7👍5🔥3
1Password is a popular password management tool that relies upon a browser extension to fill out passwords on the Web. At over a minute for a single build, things were starting to drag for the devs. Could esbuild help? A fun story with plenty of technical details.
Jarek Samic
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🔥5👍4❤1
CHALLENGE
function* generator() {
yield 1;
yield* [2, 3];
yield 4;
}
const gen = generator();
for (const value of gen) {
console.log(value);
}
❤3👍2
👍11❤4🤩2
Might come in handy for learning regular expressions or if you have a complex regular expression and you don’t know what it does (not an uncommon situation..!)
Jeff Avallone
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🔥6❤1👍1
CHALLENGE
function* generator1() {
yield 1;
yield 2;
}
function* generator2() {
yield* generator1();
yield 3;
}
const gen = generator2();
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
👍5❤3🤩1
What is the output?
Anonymous Quiz
68%
1, 2, 3
16%
1, 2, undefined
11%
1, undefined, 3
5%
undefined, 2, 3
🤩15👍8❤7
We linked to Martin's array of creative JavaScript experiments earlier, but why not finish with one that particularly tickled us? A quine is a program that takes no input but manages to produce, as output, its own source code. Here’s a fun JavaScript example that isn’t merely a quine, but a clock too.
Martin Kleppe
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🔥6❤5👍4🤔1
CHALLENGE
function* generator() {
const value = yield 1;
yield value;
}
const gen = generator();
console.log(gen.next().value);
console.log(gen.next(2).value);
👍4🤔2
❤13🤔7🤣2🤩1
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❤3👍2
CHALLENGE
function* generator() {
yield 1;
yield 2;
return 3;
}
const gen = generator();
console.log(gen.next().value);
console.log(gen.next().value);
console.log(gen.next().value);
👍2🔥2
🔥11❤4👍4🤔4
Even though Armenia 🇦🇲 is a small country, we have a really big JavaScript community 😎.
There are many events related to JavaScript, and another one is happening tomorrow: JSConf Armenia 2024!
If you are in Armenia and would like to attend, just grab your tickets from the website.
There are many events related to JavaScript, and another one is happening tomorrow: JSConf Armenia 2024!
If you are in Armenia and would like to attend, just grab your tickets from the website.
❤17👍7🤣7🔥4
CHALLENGE
function* generator() {
yield 1;
yield new Promise(resolve => resolve(2));
yield 3;
}
const gen = generator();
console.log(gen.next().value);
gen.next().value.then(console.log);
console.log(gen.next().value);
👍5🤩2❤1
👍9🔥8❤4
Josh notes that in order to truly understand promises, a fundamental part of modern JS development, we need “a surprisingly deep understanding of how JavaScript works and what its limitations are”. Luckily, this tutorial covers all the critical context you need.
Josh W Comeau
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👍8❤2🔥2
CHALLENGE
let obj1 = { key: 'value1' };
let obj2 = { key: 'value2' };
const map = new Map();
const weakMap = new WeakMap();
map.set(obj1, 'mapValue');
weakMap.set(obj2, 'weakMapValue');
obj1 = null; // Changing reference
obj2 = null; // Changing reference
console.log(map.has(obj1));
console.log(weakMap.has(obj2));
❤7👍4🔥4
🤔22🔥4🤣4👍3❤2
CHALLENGE
function* genFunc() {
yield Symbol('A');
yield new Function('return this')();
}
const obj = { key: genFunc().next().value };
obj.key = genFunc().next().value;
console.log(obj.key === globalThis);
🤔5❤4🔥2👍1