Force end defun

[FazBear]

Hi All

 

Is it possible to end a lisp at any point of the result of an if is false? i.e.

 

(if (= 1 1) (do this) (else end defun))

[rkmcswain]

You could use the (exit) function.

[FazBear]

Ah so thats what exit does :S

[Lee Mac]

IMO, I only use (exit) if I really have to - I try to write the program so that if something is false, then the rest of the program does not execute and just completes without forcing an error.

 

I am not sure what the consensus is on this, but thats my $0.02

[Freerefill]

That's the classy way to do it, Lee. But, like so many things, there are a dozen (or two dozen) different ways of accomplishing the same task. I'd personally agree with you, I like having absolute control over where the data is flowing. That way, if something goes wrong, it's that much easier to track and fix. Then again, maybe I'd like to be absolutely certain that if something occurs, the function stops.

 

I think it harkens back to the BASIC code, where programmers would use "GOTO" in place of a While loop, and an If statement to "GOTO" somewhere outside the loop to end it.

 

I can't imagine ever needed to force an escape, but then again, I'd never imagine using a (grread) loop to dynamically capture and analyze user input data using a single prompt that gets altered based on user input. *whistles innocently*

[Lee Mac]

I can't imagine ever needed to force an escape, but then again, I'd never imagine using a (grread) loop to dynamically capture and analyze user input data using a single prompt that gets altered based on user input. *whistles innocently*

 

I'd echo your opinions

 

** you and your grread fetish **

[Freerefill]

I'd echo your opinions

 

** you and your grread fetish **

 

Hey, you just wait. I've got something cooking and it's shaping up to be pretty sweet. Might take some time but it's looking real good.

[Commandobill]

Hey, you just wait. I've got something cooking and it's shaping up to be pretty sweet. Might take some time but it's looking real good.

 

cookies?

[Freerefill]

cookies?

 

None for you.

[Lee Mac]

Hey, you just wait. I've got something cooking and it's shaping up to be pretty sweet. Might take some time but it's looking real good.

 

I look forward to it

[rkmcswain]

IMO, I only use (exit) if I really have to

 

I agree, but I was specifically answering this question:

 

Is it possible to end a lisp at any point...

[Lee Mac]

I agree, but I was specifically answering this question:

 

I would have also answered in the same way - I just wanted a consensus on its usage