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<tatsumaru>
hey guys, is there any difference between typing '(pork) and (cons 'pork '()) in racket? If not why is it recommended to use cons to create lists than simply typing an '? thanks.
<bremner>
not sure where it is recommended to use cons? it is different in that it evaluates its arguments, which is sometimes what you want
<bremner>
cons is often used in recursive algorithms to add one element to the front of a list
<tatsumaru>
bremner, the book The Little Schemer recommends to prefer cons when creating lists
<bremner>
I guess it depends on context, and what your goal is.
<tatsumaru>
hmm but in the book Realm of Racket, it is said that 'a chain of cons cells' and a list are exactly the same thing, so doesn't '(pork) already contain cons by that logic?
<bremner>
sure.
<bremner>
but it's a different syntax that _in this case_ happens to do the same thing
<bremner>
in general quote and cons do different things
<bremner>
there is also (list 'pork)
<bremner>
there are lots of primitives that make lists in LISP-like languages. It's in the name, after all.
<tatsumaru>
is (list 'pork) equal to '(pork) ?
<bremner>
they evaluate to the same thing
<bremner>
rudybot: eval (list 'pork 'bun)
<rudybot>
bremner: your sandbox is ready
<rudybot>
bremner: ; Value: '(pork bun)
<tatsumaru>
I see, thank you
<bremner>
rudybot: (define x 'pork)
<rudybot>
bremner: Done.
<bremner>
rudybot: eval (list x 'bun)
<rudybot>
bremner: ; Value: '(pork bun)
<bremner>
rudybot: eval '(x bun)
<rudybot>
bremner: ; Value: '(x bun)
<tatsumaru>
hmm curious, so ' doesn't evaluate x
<bremner>
yes. that's more or list the point of quote
<bremner>
more or less
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<dzoe>
samth: thanks for looking at the spam queue
<samth>
dzoe: i only look at it when i get a notification, which sadly isn't often enough
<dzoe>
I still wonder why it got flagged though ...
<dzoe>
On the other hand, for normal humans most of our emails must look like a complete gibberish :)
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<tatsumaru>
hey, noob question - are structures in Racket similar to OOP?