> For the complete documentation index, see [llms.txt](https://ddzy.gitbook.io/ts-utility-plugins-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ddzy.gitbook.io/ts-utility-plugins-docs/utility/utility-function/isfunction.md).

# isFunction

### 说明

 检查是否`函数`

### 源码

<https://github.com/ddzy/ts-utility-plugins/tree/master/src/ddzy/utility/function/isFunction>

### 用法

{% code title="isFunction.test.ts" %}

```typescript
import { isFunction } from "../../utility/function/isFunction";

describe('isFunction', () => {
  test('isFunction should return `true` when received a function object', () => {
    const origin = [
      function () { },
      Symbol,
    ];

    for (const v of origin) {
      expect(isFunction(v)).toBeTruthy();
    }
  });
});
```

{% endcode %}