# jQuery.type()

Categories: Utilities

## jQuery.type( obj ) Returns: String

Description: Determine the internal JavaScript [[Class]] of an object.

- #### version added: 1.4.3jQuery.type( obj )

  objObject to get the internal JavaScript [[Class]] of.

A number of techniques are used to determine the exact return value for an object. The [[Class]] is determined as follows:

- If the object is undefined or null, then "undefined" or "null" is returned accordingly.
- If the object has an internal [[Class]] equivalent to one of the browser's built-in objects, the associated name is returned. (More details about this technique.)
  - jQuery.type(true) === "boolean"
  - jQuery.type(3) === "number"
  - jQuery.type("test") === "string"
  - jQuery.type(function(){}) === "function"
  - jQuery.type([]) === "array"
  - jQuery.type(new Date()) === "date"
  - jQuery.type(/test/) === "regexp"
- Everything else returns "object" as its type.

### Example:

#### Find out if the parameter is a RegExp.

    <!DOCTYPE html>
    <html>
    <head>
      <script src="http://code.jquery.com/jquery-1.7rc2.js"></script>
    </head>
    <body>
      Is it a RegExp? <b></b>
    <script>$("b").append( "" + jQuery.type(/test/) );</script>

    </body>
    </html>

#### Demo: