eq (AutoLISP)

(eq expr1 expr2)

The eq function determines whether expr1 and expr2 are bound to the same object (by setq , for example).

Arguments

expr1

The expression to be compared.

expr2

The expression to compare with expr1.

Return Values

T if the two expressions are identical; otherwise nil.

Examples

Given the following assignments:

(setq f1 '(a b c)) 
(setq f2 '(a b c)) 
(setq f3 f2)

Compare f1 and f3:

Command: (eq f1 f3)

nil

eq returns nil because f1 and f3, while containing the same value, do not refer to the same list.

Compare f3 and f2:

Command: (eq f3 f2)

T

eq returns T because f3 and f2 refer to the same list.