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Showing content from http://www.lispworks.com/documentation/HyperSpec/Body/f_kwdp.htm below:

CLHS: Function KEYWORDP

Syntax:

keywordp object => generalized-boolean

Arguments and Values:

object---an object.

generalized-boolean---a generalized boolean.

Description:

Returns true if object is a keyword[1]; otherwise, returns false.

Examples:

 (keywordp 'elephant) =>  false
 (keywordp 12) =>  false
 (keywordp :test) =>  true
 (keywordp ':test) =>  true
 (keywordp nil) =>  false
 (keywordp :nil) =>  true
 (keywordp '(:test)) =>  false
 (keywordp "hello") =>  false
 (keywordp ":hello") =>  false
 (keywordp '&optional) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

constantp, keyword, symbolp, symbol-package

Notes: None.

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