A PDF parser built in Rust with bindings for Node (plus WASM, Rust, and Python) — it worked great in my testing. It includes OCR, handles layouts/is spatially aware, and is fast (a complex 140-page PDF took ~10 seconds). Here's how to get started from Node.
LlamaIndex
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❤5👍2🔥1
CHALLENGE
class Timer {
constructor() { this.seconds = 0; }
start() {
this.tick = () => { this.seconds++; return this.seconds; };
return this.tick;
}
}
const t = new Timer();
const tick = t.start();
const obj = { seconds: 100, tick };
console.log(tick(), obj.tick(), t.seconds);👍3❤1🔥1
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From the creator of NodeBook, a thorough guide to Node's internals, comes a scroll-driven visualization following every step a single HTTP POST request takes from the user's click to Node's event loop and on to a database behind it.
Ishtmeet Singh
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CHALLENGE
const primArr = [1, 2, 3];
const copyArr = [...primArr];
copyArr[0] = 99;
const objArr = [{ x: 1 }, { x: 2 }];
const copyObjArr = [...objArr];
copyObjArr[0].x = 99;
console.log(primArr[0], copyArr[0], objArr[0].x, copyObjArr[0].x);
❤2
🔥1
CHALLENGE
const arr = [1, [2, 3], [4, [5, 6]], 7];
const a = arr.flat();
const b = arr.flat(2);
const c = arr.flatMap(x => Array.isArray(x) ? x : [x, x]);
const d = [1, 2, 3].flatMap(x => [[x]]);
console.log(JSON.stringify([a, b, c, d]));
❤1👍1🔥1
What is the output?
Anonymous Quiz
20%
[[1,2,3,4,[5,6],7],[1,2,3,4,5,6,7],[1,1,2,3,4,[5,6],7,7],[1,2,3]]
36%
[[1,2,3,4,[5,6],7],[1,2,3,4,5,6,7],[1,1,2,3,4,[5,6],7,7],[[1],[2],[3]]]
34%
[[1,2,3,4,5,6,7],[1,2,3,4,5,6,7],[1,1,2,3,4,[5,6],7,7],[[1],[2],[3]]]
9%
[[1,2,3,4,[5,6],7],[1,2,3,4,5,6,7],[1,1,2,3,4,5,6,7,7],[[1],[2],[3]]]
👍2
CHALLENGE
const source = {
_val: 1,
get val() { return this._val; }
};
const copy1 = Object.assign({}, source);
source._val = 100;
const copy2 = { ...source };
copy1._val = 999;
console.log(copy1.val, copy2.val, source.val, copy1._val);❤7🤣2👍1🔥1
What is the output?
Anonymous Quiz
20%
1 100 1 999
38%
1 100 100 999
30%
100 100 100 999
12%
1 1 100 999
❤4👍1
CHALLENGE
function Animal(name) {
this.name = name;
}
Animal.prototype.speak = function () {
return `${this.name} makes a sound`;
};
function Dog(name) {
Animal.call(this, name);
}
Dog.prototype = Object.create(Animal.prototype);
Dog.prototype.constructor = Dog;
Dog.prototype.speak = function () {
return `${Animal.prototype.speak.call(this)} (bark)`;
};
const d = new Dog('Rex');
console.log(
d.speak(),
d instanceof Animal,
d.constructor === Dog,
Object.getPrototypeOf(d) === Dog.prototype
);
export {};❤1👍1🔥1
CHALLENGE
class Base {
static count = 0;
static #secret;
static {
Base.#secret = 10;
Base.count += 1;
}
static getSecret() {
return Base.#secret;
}
}
class Derived extends Base {
static {
Base.count += 100;
}
}
console.log(Base.count, Derived.count, Base.getSecret());❤1🔥1
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A practical guide to publishing npm packages more safely in 2026, written by someone who's released several popular packages (like postcss and nanoid). As well as showing how to use things like staged publishing and trusted publishing, he explains why and the security benefits of doing so.
Andrey Sitnik
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CHALLENGE
function* inner() {
yield 1;
yield 2;
return 10;
}
function* outer() {
const result = yield* inner();
yield result;
yield 3;
}
const gen = outer();
const a = gen.next().value;
const b = gen.next().value;
const c = gen.next().value;
const d = gen.next().value;
console.log(a, b, c, d);What is the output?
Anonymous Quiz
26%
1 2 3 10
36%
1 2 undefined 3
21%
1 2 10 undefined
17%
1 2 10 3
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A new entry into the growing field of JS/TS native ahead-of-time compilers that makes the promise that "what compiles behaves byte-for-byte like Node." Static by default, but you can opt in to a --dynamic mode which embeds a JavaScript engine for runtime dynamism. GitHub repo.
Vercel Labs
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CHALLENGE
function tag(strings, ...values) {
// strings.raw preserves literal escape sequences
const rawParts = strings.raw;
let result = rawParts.join('|');
result += '::' + values.join(',');
return result;
}
const x = 5;
const output = tag`Line1\nLine2${x}End`;
console.log(output);❤4👍4🔥1
What is the output?
Anonymous Quiz
31%
Line1\nLine2|End::5
42%
Line1\nLine2,End::5
20%
Line1nLine2|End::5
7%
5::Line1\nLine2|End
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