19 lines
450 B
Markdown
19 lines
450 B
Markdown
---
|
|
title: isAsyncFunction
|
|
tags: type,function,intermediate
|
|
---
|
|
|
|
Checks if the given argument is an `async` function.
|
|
|
|
- Use `Object.prototype.toString()` and `Function.prototype.call()` and check if the result is `'[object AsyncFunction]'`.
|
|
|
|
```js
|
|
const isAsyncFunction = val =>
|
|
Object.prototype.toString.call(val) === '[object AsyncFunction]';
|
|
```
|
|
|
|
```js
|
|
isAsyncFunction(function() {}); // false
|
|
isAsyncFunction(async function() {}); // true
|
|
```
|