CHALLENGE
const obj1 = { a: 1, b: { c: 2 } };
const obj2 = { ...obj1 };
const obj3 = obj1;
obj2.a = 10;
obj2.b.c = 20;
obj3.b.c = 30;
console.log(obj1.a);
console.log(obj1.b.c);
console.log(obj2.a);
console.log(obj2.b.c);
console.log(obj3.a);
console.log(obj3.b.c);❤5👍1🔥1
What is the output?
Anonymous Quiz
37%
1 30 10 30 1 30
26%
1 20 10 20 1 20
24%
1 2 10 20 1 2
13%
10 20 10 20 10 20
❤5🔥3👍1
The results of the popular annual JavaScript survey are out, and we’re focusing on the most relevant bit to Node.js: backend frameworks. Express still leads the way, but NestJS continues to grow rapidly. Meanwhile, Hono comes top in developer satisfaction.
Devographics
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❤5👍4🔥3
CHALLENGE
function memoize(fn) {
const cache = new Map();
return function(...args) {
const key = JSON.stringify(args);
if (cache.has(key)) {
return cache.get(key);
}
const result = fn.apply(this, args);
cache.set(key, result);
return result;
};
}
const fibonacci = memoize(function(n) {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
});
console.log(fibonacci(10));
console.log(fibonacci.cache?.size || 'undefined');🔥5👍3❤1
❤2👍2🔥2
Have you ever wondered how systems are designed to ensure reliable event delivery and processing? How can we minimise event loss to a very low level: or even achieve near-zero message loss and highly reliable processing?
nairihar
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🔥9❤6👍3
CHALLENGE
console.log('1');
setTimeout(() => console.log('2'), 0);
Promise.resolve().then(() => console.log('3'));
console.log('4');
Promise.resolve().then(() => {
console.log('5');
setTimeout(() => console.log('6'), 0);
});
console.log('7');❤1👍1🔥1
What is the output?
Anonymous Quiz
17%
1 4 7 5 3 6 2
28%
1 7 4 3 5 2 6
37%
1 4 7 3 5 2 6
18%
1 4 7 2 3 5 6
❤12🤣3
TypeScript 6.0 is now in beta. It's a "clean up your tsconfig" release, not meant to wow but to make sense as a bridge to the eventual Go-powered 'native' TypeScript 7 compiler.
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❤5👍4🔥3
Transformers.js brings Hugging Face’s transformer models directly to the JavaScript world, meaning you can run numerous NLP, vision, and audio models right from Node.js. v4 is WebGPU powered and is now installable with npm.
Hugging Face
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👍5🔥5❤2
CHALLENGE
const operations = {
value: 10,
multiply: function(x) {
return this.value * x;
},
arrow: (x) => {
return this.value * x;
},
nested: function() {
const inner = () => this.value * 2;
return inner();
}
};
console.log(operations.multiply(3));
console.log(operations.arrow(3));
console.log(operations.nested());👍6🔥4
❤2🔥2
CHALLENGE
class Calculator {
constructor(value) {
this.value = value;
}
add(num) {
this.value += num;
return this;
}
getValue = () => this.value;
}
const calc = new Calculator(10);
const addMethod = calc.add;
const getValueMethod = calc.getValue;
addMethod.call({value: 5}, 3);
console.log(calc.getValue());
console.log(getValueMethod());❤5👍2🔥2🤩2
👍3❤2
A smooth, fast way to browse packages on the official npm registry. It’s certainly fast, smooth, and you see more info up front and center - check out the axios page for example. “We’re not replacing the npm registry, but instead providing an elevated developer experience through a fast, modern UI.”
npmx
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🔥5❤2👍2🤣1
CHALLENGE
const wm = new WeakMap();
const obj1 = { name: 'Sarah' };
const obj2 = { name: 'Mike' };
wm.set(obj1, 'developer');
wm.set(obj2, 'designer');
console.log(wm.get(obj1));
console.log(wm.has(obj2));
console.log(wm.get({ name: 'Sarah' }));
console.log(wm.delete(obj1));
console.log(wm.has(obj1));
❤4🔥2👍1
A fun technical exploration of Symbol.dispose and using, two new features that’ll ease many headaches around cleaning up after yourself: closing connections, freeing resources, etc. Just watch out for the Muppets…
Mat Marquis
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❤5👍5🔥2
CHALLENGE
const cache = new Map();
function memoize(fn) {
return function(...args) {
const key = JSON.stringify(args);
if (cache.has(key)) {
return cache.get(key);
}
const result = fn(...args);
cache.set(key, result);
return result;
};
}
const fibonacci = memoize((n) => {
if (n <= 1) return n;
return fibonacci(n - 1) + fibonacci(n - 2);
});
console.log(fibonacci(5));
console.log(cache.size);
❤9🔥2👍1