lambda (AutoLISP)

Defines an anonymous function

Supported Platforms: Windows and Mac OS

Signature

(lambda arguments expr ...)

arguments

Type: List

Arguments passed to an expression.

expr

Type: List

An AutoLISP expression.

Return Values

Type: Integer, Real, String, List, T, Symbol, ads_name, or nil

Value of the last expr.

Remarks

Use the lambda function when the overhead of defining a new function is not justified. It also makes your intention more apparent by laying out the function at the spot where it is to be used. This function returns the value of its last expr, and is often used in conjunction with apply and/or mapcar to perform a function on a list.

Examples

The following examples demonstrate the lambda function:

(apply '(lambda (x y z)
          (* x (- y z))
        )
        '(5 20 14)
)
30

(setq counter 0)
(mapcar '(lambda (x)
          (setq counter (1+ counter))
          (* x 5)
        ) 
        '(2 4 -6 10.2)
)
0
(10 20 -30 51.0)