18 lines
495 B
Markdown
18 lines
495 B
Markdown
### Promisify
|
|
|
|
Creates a promisified version of the given callback-style function. In Node 8+, you
|
|
can use [`util.promisify`](https://nodejs.org/api/util.html#util_util_promisify_original)
|
|
|
|
```js
|
|
const promisify = func =>
|
|
(...args) =>
|
|
new Promise((resolve, reject) =>
|
|
func(...args, (err, result) =>
|
|
err
|
|
? reject(err)
|
|
: resolve(result))
|
|
)
|
|
// const stat = promisify(fs.stat)
|
|
// stat('foo.txt') -> Promise resolves if `foo.txt` exists, otherwise rejects
|
|
```
|