What is the output?
Anonymous Quiz
19%
[ 1, 9, 25, 49 ]
50%
[ 1, 16, 49, 100 ]
17%
[ 1, 9, 49 ]
14%
[ 1, 9, 25, 49, 81 ]
❤4🤔1
CHALLENGE
const p1 = new Promise((resolve) => {
console.log("A");
resolve("B");
});
const p2 = p1.then((val) => {
console.log(val);
return "C";
});
p2.then((val) => console.log(val));
console.log("D");
❤3👍1
❤4🤔3
CHALLENGE
class EventEmitter {
#listeners = new Map();
on(event, listener) {
if (!this.#listeners.has(event)) {
this.#listeners.set(event, []);
}
this.#listeners.get(event).push(listener);
return this;
}
emit(event, ...args) {
const handlers = this.#listeners.get(event) ?? [];
handlers.forEach(fn => fn(...args));
return this;
}
}
const emitter = new EventEmitter();
const log = [];
emitter
.on("data", val => log.push(`A:${val}`))
.on("data", val => log.push(`B:${val * 2}`))
.on("end", () => log.push("done"));
emitter.emit("data", 5).emit("data", 3).emit("end");
console.log(log.join(","));
👍3
What is the output?
Anonymous Quiz
37%
A:5,B:10,A:3,B:6,done
33%
A:5,A:3,B:6,B:10,done
23%
A:5,B:10,done,A:3,B:6
8%
A:5,B:25,A:3,B:9,done
❤5
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❤5👍2🔥2
npm is the only major package manager that runs dependency install scripts (e.g. postinstall) by default, and they’ve become too much of a security weakness, says Jamie, who works for GitHub (maintainers of npm). This RFC features further discussion of the idea and the tradeoffs involved.
Jamie Magee
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❤4🔥1
CHALLENGE
const createModule = (() => {
const privateCache = new WeakMap();
return function(name) {
const state = { name, version: 1, active: true };
privateCache.set(state, { accessCount: 0 });
return {
getInfo() {
const meta = privateCache.get(state);
meta.accessCount++;
return `${state.name}@v${state.version}`;
},
getAccessCount() {
return privateCache.get(state).accessCount;
},
upgrade() {
state.version++;
return this;
}
};
};
})();
const mod = createModule("auth");
mod.upgrade().upgrade();
console.log(mod.getInfo());
console.log(mod.getAccessCount());
❤2👍1
❤3👍2
Mark, well known for maintaining Redux and creating Redux Toolkit, goes deep into his daily development workflow, including his use of OpenCode (an open source JavaScript-powered coding agent), how he manages his knowledge base, tasks, and more.
Mark Erikson
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❤6👍3🔥2
CHALLENGE
const str = "JavaScript is Awesome!";
const result = str
.split(" ")
.map((word, i) =>
i % 2 === 0
? word.toUpperCase()
: word.toLowerCase()
)
.join("-");
const reversed = result
.split("")
.reduce((acc, char) => char + acc, "");
console.log(reversed);
🔥2❤1
What is the output?
Anonymous Quiz
39%
!EMOSEWA-si-TPIRCSAVAJ
24%
!emosewa-is-tpircsavaj
21%
!EMOSEWA-IS-TPIRCSAVAJ
15%
!emosewa-IS-tpircsavaj
❤4🔥2
Given a valid OpenAPI v3 or Swagger v2 spec, generate models, requests, hooks, and mocks for React, Vue, Svelte, Solid, and Hono apps, or even plain fetch.
Victor Bury
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❤4👍2🔥1
CHALLENGE
const delay = (ms, val) => new Promise(res => setTimeout(res, ms, val));
async function* asyncGen() {
yield await delay(10, "alpha");
yield await delay(10, "beta");
yield await delay(10, "gamma");
}
async function run() {
const results = [];
const gen = asyncGen();
const [first, , third] = await Promise.all([
gen.next(),
gen.next(),
gen.next()
]);
results.push(first.value, third.value);
const p1 = Promise.resolve("x").then(v => v + "1");
const p2 = Promise.reject("err").catch(e => e + "2");
results.push(...(await Promise.all([p1, p2])));
console.log(results);
}
run();
❤7👍2
What is the output?
Anonymous Quiz
19%
[ 'alpha', 'gamma', 'x1', 'err' ]
31%
[ 'alpha', 'beta', 'x1', 'err2' ]
26%
[ 'alpha', 'beta', 'x1', 'err' ]
25%
[ 'alpha', 'gamma', 'x1', 'err2' ]
❤2🔥1
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❤5👍1🔥1
CHALLENGE
const tag = (strings, ...values) => {
return strings.reduce((result, str, i) => {
const value = values[i - 1];
const transformed =
typeof value === "number" ? `[${value ** 2}]` : `{${value}}`;
return result + transformed + str;
});
};
const name = "Sofia";
const score = 4;
const level = "gold";
const output = tag`Player: ${name}, Score: ${score}, Rank: ${level}`;
console.log(output);
🔥3❤2👍2
For a while, Node’s long-standing web framework, Express.js, was looking a bit stale and projects like Fastify were beginning to carry the torch, but a major reboot that began in 2024 brought Express back to the fore. Now Express’s brand, website, and docs have time-travelled to 2026 too.
Sebastian Beltran
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❤7👍3🤩3
CHALLENGE
const prefix = "get";
const suffix = "Name";
const registry = {
[`${prefix}Full${suffix}`]: function () {
return `${this.first} ${this.last}`;
},
[`${prefix}Short${suffix}`]: function () {
return this.first[0] + ". " + this.last;
},
};
const person = {
first: "Leonardo",
last: "Fibonacci",
...registry,
};
const key = ["Full", "Short"][1];
console.log(person[`${prefix}${key}${suffix}`]());
❤1👍1