YouTipMisc Type
# jQuery.type() Method
[jQuery Misc Methods](#)
## Example
Is the parameter a regular expression?
Is this a regular expression? $(function(){ $("b").append("" + jQuery.type( /test/ )); })
[Try it »](#)
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## Definition and Usage
The $.type() function is used to determine the type of a JavaScript built-in object and returns the type name in lowercase.
If the object is undefined or null, it returns the corresponding "undefined" or "null".
```javascript
$.type( undefined ) === "undefined"
$.type() === "undefined"
$.type( window.notDefined ) === "undefined"
$.type( null ) === "null"
If the object has an internal property [] that matches the [] of a browser's built-in object, we return the corresponding [] name.
```javascript
$.type( true ) === "boolean"
$.type( 3 ) === "number"
$.type( "test" ) === "string"
$.type( function(){} ) === "function"
$.type( [] ) === "array"
$.type( new Date() ) === "date"
$.type( new Error() ) === "error"
// Added support in jQuery 1.9
$.type( /test/ ) === "regexp"
## Syntax
_$_.type( obj )
| Parameter | Description |
| :--- | :--- |
| _obj_ | Any type. The object of any type for which the type needs to be determined. |
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