I have following code, fileStatsPromises
is of Promise<Stats>[]
, both foo
and bar
are Promise<Stats>[]
. What is the correct way to await them? I want to get <Stats>[]
.
const files = await readDir(currentDir);
const fileStatsPromises = files.map(filename => path.join(currentDir, filename)).map(stat);
const foo = await fileStatsPromises;
const bar = await Promise.all(fileStatsPromises);
EDIT: a minimal example.
function makePromise() {
return Promise.resolve("hello");
}
const promiseArray = [];
// const promiseArray = [] as Promise<string>[];
for (let i = 0; i < 10; i++) {
promiseArray.push(makePromise());
}
(async () => {
const foo = await promiseArray;
const bar = await Promise.all(promiseArray);
})();
This is correct:
const bar = await Promise.all(promiseArray);
await Promise.all([...])
takes an array of Promises and returns an array of results.
bar
will be an array: ['hello', ..., 'hello']
You can also deconstruct the resulting array:
const [bar1, ..., bar10] = await Promise.all(promiseArray);
console.log(bar1); // hello
console.log(bar7); // hello