(eq)

(equal)

(eq statement1 statement2)

Determine whether two expressions are bound to the same symbol.

This function determines whether two expressions are bound to the same symbol. If so, eq returns T; if not, eq returns nil.

Examples

Code	Comments
(setq s1 '(1 2 3))	Create symbol s1.
(setq s2 '(1 2 3))	Create symbol s2.
(setq s3 s2)	Bind s2 to s3.
(eq s1 s3)	nil because s1 and s3 are not the same list.
(eq s3 s2)	T because s3 and s2 are the same list.

NOTE The eq function is not the same as the = (equal to operator) and equal(equal statement1 statement2 [tolerance])(IDR_166)functions. The = function returns T when two numbers or strings are equal. The equal function returns T when two expressions are equal. The eq function returns T when two expressions are bound to the same symbol.

Tell me about...

(boundp item)

(setq symbol1 statement1 [symbol2 statement2] ...)

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language