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2017-12-28 08:30:19 +00:00
parent 294a22ea5e
commit 203edf9ba2
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14
snippets/promisify.md
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@ -8,15 +8,13 @@ Use the `...rest` operator to pass in all the parameters.
*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 promisify = func => (...args) =>
new Promise((resolve, reject) =>
func(...args, (err, result) => (err ? reject(err) : resolve(result)))
);
```
```js
const delay = promisify((d, cb) => setTimeout(cb, d))
delay(2000).then(() => console.log('Hi!')) // // Promise resolves after 2s
const delay = promisify((d, cb) => setTimeout(cb, d));
delay(2000).then(() => console.log('Hi!')); // // Promise resolves after 2s
```