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