CHALLENGE
const factorial = (function () {
const cache = {};
return function inner(n) {
if (n in cache) return cache[n];
return (cache[n] = n <= 1 ? 1 : n * inner(n - 1));
};
})();
console.log(factorial(5));
console.log(factorial(5));
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Uses whatever precise timing capabilities are available (e.g. process.hrtime or peformance.now). You can then benchmark whatever functions you want, specify how long or how many times to benchmark for, and get a variety of stats in return. GitHub repo.
Tinylibs
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👍7❤2🔥2
CHALLENGE
const obj = { value: 10 };
const result = (obj.value += 5) && obj.value;
console.log(result);
👍2
👍18❤4🔥3
Names, bios, addresses, zip codes, dates, monetary amounts, transactions, and a lot more besides. I really like the guided DevTools console based demo you can try – an idea other projects should consider. GitHub repo.
Faker.js Team
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👍7🔥4❤2
CHALLENGE
async function test() {
return (await Promise.resolve(0)) || 10;
}
test().then(console.log);
👍11
🤩9👍6❤3
A nicely diagrammed deep dive (and it really is deep) into a technique that allows malicious parties to turn a file write vulnerability in a Node app into a remote code execution exploit even when the file system is mounted read-only.
Stefan Schiller (Sonar)
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🔥4❤2👍2🤔1
CHALLENGE
const arr = [1, 2, 3];
const copy = [...arr];
copy.push(4);
console.log(arr);
console.log(copy);
👍4
What is the output?
Anonymous Quiz
8%
[1, 2, 3, 4], Error
11%
[1, 2, 3], Error
21%
[1, 2, 3, 4], [1, 2, 3, 4]
60%
[1, 2, 3], [1, 2, 3, 4]
👍15❤10🔥9🤔1
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👍8❤3🔥2🤩1
CHALLENGE ❓
console.log(typeof typeof 42);
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👍5🔥3❤2
🤣26🤔15👍8❤1
The
??= nullish coalescing assignment operator snuck into JavaScript a few years ago via ECMAScript 2021 and has been broadly supported almost everywhere for ages. Trevor shows off how it can tighten up your assignments here.Trevor I. Lasn
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❤8🔥4👍3
CHALLENGE ❓
let name = "Alice";
(function() {
let name = "Bob";
console.log(name);
})();
console.log(name);
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👍2🔥1
What is the output?
Anonymous Quiz
57%
"Bob", "Alice"
9%
"Alice", "Alice"
10%
"Bob", "Bob
24%
"Alice", "Bob"
👍18❤4🔥4
Give this online tool the name of an npm package and you get a quick ‘dashboard’ style view of the project’s main statistics, covering areas like quality scores, commits, open issues, releases, bundle size, and more.
Shrinath Nayak
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❤3👍2🔥2🤩1
CHALLENGE ❓
const sym1 = Symbol("id");
const sym2 = Symbol("id");
console.log(sym1 === sym2);
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👍3
🤔32🤣31❤3👍3🔥3
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👍6❤2🔥2