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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
commit 53c16dbf65
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6
snippets/isDuplexStream.md
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@ -5,8 +5,8 @@ tags: node,type,intermediate
Checks if the given argument is a duplex (readable and writable) stream.
Check if the value is different from `null`, use `typeof` to check if a value is of type `object` and the `pipe` property is of type `function`.
Additionally check if the `typeof` the `_read`, `_write` and `_readableState`, `_writableState` properties are `function` and `object` respectively.
- Check if the value is different from `null`, use `typeof` to check if a value is of type `object` and the `pipe` property is of type `function`.
- Additionally check if the `typeof` the `_read`, `_write` and `_readableState`, `_writableState` properties are `function` and `object` respectively.
```js
const isDuplexStream = val =>
@ -22,4 +22,4 @@ const isDuplexStream = val =>
```js
const Stream = require('stream');
isDuplexStream(new Stream.Duplex()); // true
```
```