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newlispfanclub.alh.net • View topic - cons

cons

Q&A's, tips, howto's

cons

Postby eddier » Fri Dec 19, 2003 9:39 pm

Would it be hard to make (cons take multiple arguments?

Example

(cons 'a 'b 'c) => (a b c)

Eddie
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Postby HPW » Fri Dec 19, 2003 9:47 pm

Why not?

(list 'a 'b 'c)
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Postby Sammo » Fri Dec 19, 2003 9:49 pm

In newLISP, isn't 'list' basically the same as 'cons' but allowing an arbitray number of args? Is so, can you (setq mycons list) and then (mycons 'a 'b 'c), or perhaps use (constant cons list) in the appropriate context to reassign 'cons'?
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Postby Lutz » Sat Dec 20, 2003 12:04 am

I agree with Sam: 'cons' with multiple args for 'cons' is like using 'list' , also
'cons' is also a lot like 'push' becuase it can take a list as the second argument:

(set 'lst '(b c))

(cons 'a lst) => (a b c)

(push 'a lst) => 'a

lst => (a b c)

the difference beeing, that push is non-destructive and returns the new list, while push has the side effect of changing the list.

If it where for me, I would just dump 'cons', because I think having 'list' and 'push', you got all you ever need, but ... there are many traditional LISPers who wouldn't want to 'lisp' without it. Personally, I think, I never have used it.

Lutz
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Postby eddier » Mon Dec 22, 2003 2:20 pm

eddier
 
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Postby HPW » Mon Dec 22, 2003 2:44 pm

HPW
 
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Postby Lutz » Mon Dec 22, 2003 5:37 pm

Lutz
 
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