JavaScript
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❤6👍2
CHALLENGE

class Base {
static count = 0;
static increment() {
this.count++;
return this.count;
}
}

class Derived extends Base {
static count = 10;
}

console.log(Base.increment(), Derived.increment(), Base.count, Derived.count);
❤1
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CHALLENGE

let counter = 0;
const mod = {
get counter() { return counter; },
increment() { counter++; }
};

const { counter: snapshotCounter } = mod;
mod.increment();
mod.increment();

console.log(snapshotCounter, mod.counter, counter);
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What is the output?
Anonymous Quiz
31%
0 2 2
28%
0 0 0
21%
0 1 2
20%
2 2 2
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CHALLENGE

const obj = {
value: 42,
getValue() { return this?.value; },
getValueArrow: () => this?.value
};
const { getValue, getValueArrow } = obj;
console.log(obj.getValue(), getValue(), obj.getValueArrow(), getValueArrow());
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CHALLENGE

class Base {
value = 10;
getValue = () => this.value;
constructor() {
this.value = 20;
}
}

class Derived extends Base {
value = 30;
}

const d = new Derived();
console.log(d.getValue(), d.value);
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What is the output?
Anonymous Quiz
22%
10 30
42%
20 30
15%
20 20
21%
30 30
CHALLENGE

let order = [];
function a() {
try {
return 'try';
} finally {
order.push('a-finally');
return 'a-final-return';
}
}
function b() {
try {
throw new Error('x');
} catch (e) {
order.push('b-catch');
return 'b-catch-return';
} finally {
order.push('b-finally');
}
}
console.log(a(), b(), order.join(','));
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CHALLENGE

const order = [];
order.push('start');
setTimeout(() => { order.push('timeout'); console.log(order.join(',')); }, 0);
Promise.resolve().then(() => order.push('promise1'));
async function foo() {
order.push('foo start');
await null;
order.push('foo end');
}
foo();
Promise.resolve().then(() => order.push('promise2'));
order.push('end');
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