JuniorTheoryCommon

What does the program print (lines separated by spaces)?

JavaScript

async function double(n) {
    return n * 2;
}

const x = double(5);
x.then((v) => console.log(v));
console.log(x === 10);

false 10

Expecting true 10: an async function always returns a promise, so x is a promise, not 10, and x === 10 is false.
Expecting 10 first: the then callback waits in the microtask queue until the current code, including the last line, has finished.

How do you get the value 10 out of double(5) inside another async function?
What do typeof x and x instanceof Promise give for this x?

JuniorTheoryCommon

JavaScript

async function double(n) {
    return n * 2;
}

const x = double(5);
x.then((v) => console.log(v));
console.log(x === 10);

false 10

Expecting true 10: an async function always returns a promise, so x is a promise, not 10, and x === 10 is false.
Expecting 10 first: the then callback waits in the microtask queue until the current code, including the last line, has finished.

How do you get the value 10 out of double(5) inside another async function?
What do typeof x and x instanceof Promise give for this x?