`Promise.all(iterable)` is a method that returns a single Promise that resolves when all promises in the iterable argument have resolved, or rejects with the reason of the first promise in the iterable that rejected.
Here’s how it can be used:
```
// this is an array of Promises
const promisesArray = [
Promise.resolve(1),
Promise.resolve(2),
Promise.resolve(3)
];
Promise.all(promisesArray)
.then(result => {
// result is an array of resolved values
console.log(result); // [1, 2, 3]
})
.catch(error => {
// if any of the promises reject, the error will be caught here
console.error(error);
});
```
With `Promise.all(iterable)`, you’re able to resolve multiple promises simultaneously. This can come in handy when you’re dealing with a group of asynchronous operations and you want to wait until all of them have finished.
You can also use `Promise.all(iterable)` with async/await:
```
async function resolvePromises() {
try {
const promisesArray = [
Promise.resolve(1),
Promise.resolve(2),
Promise.resolve(3)
];
resolvePromises();
```
Remember, `Promise.all(iterable)` will automatically reject as soon as one of the promises in the iterable rejects. All other promises that are resolved after the rejection are effectively ignored.
If you need all promises to resolve/reject and to know which ones failed, you should use `Promise.allSettled(iterable)` instead.
