25 lines
551 B
Markdown
25 lines
551 B
Markdown
---
|
|
title: Value is stream
|
|
type: snippet
|
|
language: javascript
|
|
tags: [node,type]
|
|
cover: mountain-lake-cottage-2
|
|
dateModified: 2020-10-20T23:02:01+03:00
|
|
---
|
|
|
|
Checks if the given argument is a stream.
|
|
|
|
- Check if the value is different from `null`.
|
|
- Use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.
|
|
|
|
```js
|
|
const isStream = val =>
|
|
val !== null && typeof val === 'object' && typeof val.pipe === 'function';
|
|
```
|
|
|
|
```js
|
|
const fs = require('fs');
|
|
|
|
isStream(fs.createReadStream('test.txt')); // true
|
|
```
|