Topic: Deconstructing Lists

[CAB]

Hold on.
That doesn't wash with me.
Confused as usual.

Using apply like this
(apply 'Return_Same_Items lst)
is equivalent to
(Return_Same_Items (car lst))
(Return_Same_Items (cadr lst))

Or I am I totally nuts.

I thought your subroutine expected two arguments?

[MP]

Close.

(apply 'Return_Same_Items lst)

Is equivalent to --

(Return_Same_Items (car lst) (cadr lst))

Let's now consider which is better --

(/ number 2.0) versus (* number 0.5)

Discuss.

[whdjr]

Isn't that kinda like 'a glass half full' and 'a glass half empty'.

 

[MP]

Ding ding ding!

(Though it's bereft any optimism context).

[CAB]

OK so I'm crazy, but i did figure it out with your help.
Just wanted to see if i could do it with an indirect function call.

Code: [Select]

(DEFUN XYZ (A1 A2)
  (+ a1 a2)
)

(defun split (fun arg)
  (if (= (length arg) 2)
    (apply fun arg)
    (prompt "\n**  Error in data - expected list of two items")
  )
)

(defun c:test ()
  (split 'XYZ (list 3 5))
)