Is there a difference between the previous code (red) and the new one (green) ?
Actually, there is 35second difference😠
The previous code was, on every loop, creating a new object, always deallocating and reallocating memory, while the second example creates one object (a cache) and save each item into it.
Eduard Krivánek
Actually, there is 35second difference
The previous code was, on every loop, creating a new object, always deallocating and reallocating memory, while the second example creates one object (a cache) and save each item into it.
Eduard Krivánek
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👍7🔥4❤3
CHALLENGE
class EventBus {
constructor() {
this.events = new Map();
}
on(event, callback) {
if (!this.events.has(event)) {
this.events.set(event, []);
}
this.events.get(event).push(callback);
}
emit(event, data) {
if (this.events.has(event)) {
this.events.get(event).forEach(callback => callback(data));
}
}
}
const bus = new EventBus();
bus.on('user', name => console.log(`Hello ${name}`));
bus.on('user', name => console.log(`Welcome ${name}`));
bus.emit('user', 'Sarah');
bus.emit('admin', 'John');❤3🤔2
What is the output?
Anonymous Quiz
42%
Hello Sarah Welcome Sarah
16%
Welcome Sarah
35%
Hello Sarah Welcome Sarah Hello John Welcome John
6%
Hello Sarah
❤7👍1🔥1
Since v23.6 (and in LTS since v22.18.0), Node has supported running (most) TypeScript code by stripping the types out first. The Calm team was excited about the potential for improving productivity and DX, and set a migration in process. Here’s a look at the challenges encountered and what the end results were.
Stuart Dotson (Calm)
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CHALLENGE
const original = { a: 1, b: { c: 2 } };
const shallow = { ...original };
const deep = JSON.parse(JSON.stringify(original));
shallow.a = 10;
shallow.b.c = 20;
deep.a = 100;
deep.b.c = 200;
const frozen = Object.freeze({ x: 1, y: { z: 2 } });
frozen.x = 99;
frozen.y.z = 99;
console.log(original.a, original.b.c, frozen.x, frozen.y.z);❤2🔥2
❤4👍2
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CHALLENGE
async function fetchData() {
console.log('1');
return Promise.resolve('data');
}
async function processData() {
console.log('2');
const result = await fetchData();
console.log('3');
return result;
}
console.log('4');
processData().then(() => console.log('5'));
console.log('6');