mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
53 lines
1.4 KiB
53 lines
1.4 KiB
2 years ago
|
## kept-promise
|
||
|
|
|
||
|
|
### Instructions
|
||
|
|
|
||
|
|
Thing in your code does not always happen as fast as you would like.
|
||
|
|
|
||
|
|
Sometimes it is important to wait for a function to finish before keep going on with your life.
|
||
|
|
|
||
|
|
Create an asynchronous function `processInfo` in the file `kept-promise.js`. The function `processInfo` will take an asynchronous function as an input, and it will print the message `Ok!` if the return of the input function is zero or a multiple of two, `Error!` otherwise.
|
||
|
|
|
||
|
|
The following function can be used as an example of input function for `processInfo`:
|
||
|
|
|
||
|
|
```js
|
||
|
|
const getImportantInfo = _ =>
|
||
|
|
new Promise(resolve => {
|
||
|
|
setTimeout(() => resolve(Math.round(Math.random() * 10)), 1000)
|
||
|
|
})
|
||
|
|
```
|
||
|
|
|
||
|
|
> Assume that your function will always get a valid input function
|
||
|
|
|
||
|
|
### Example
|
||
|
|
|
||
|
|
The following script `main.js` can be used to test your function:
|
||
|
|
|
||
|
|
```js
|
||
|
|
import processInfo from './kept-promise.js'
|
||
|
|
|
||
|
|
const getImportantInfo = _ =>
|
||
|
|
new Promise(resolve => {
|
||
|
|
setTimeout(() => resolve(Math.round(Math.random() * 10)), 1000)
|
||
|
|
})
|
||
|
|
|
||
|
|
console.log(await processInfo(getImportantInfo))
|
||
|
|
```
|
||
|
|
|
||
|
|
The output should be the following:
|
||
|
|
|
||
|
|
```console
|
||
|
|
$ node main.js
|
||
|
|
Ok!
|
||
|
|
$ node main.js
|
||
|
|
Error!
|
||
|
|
$ node main.js
|
||
|
|
Ok!
|
||
|
|
$
|
||
|
|
```
|
||
|
|
|
||
|
|
### Notions
|
||
|
|
|
||
|
|
- [Using promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises)
|
||
|
|
- [async function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function)
|