Thursday, October 21, 2010

SICP 2.4: Implementing cons, car, and cdr

From SICP section 2.1.3 What Is Meant by Data?

Exercise 2.4 gives us the following alternative procedual implementation for creating pairs.
(define (cons x y)
(lambda (m) (m x y)))

(define (car z)
(z (lambda (p q) p)))

Using this implementation, we are told to verify that (car (cons x y)) yields x for any objects x and y using the substitution model from section 1.1.5.

Once we've done that, we need to write the corresponding definition of cdr.

Our first step to verifying that this implementation for cons and car work should be to put the code in a Scheme interpreter and see them work.
> (car (cons 2 3))
2
> (car (cons 15 "Hello"))
15
> (car (cons "Hi!" 42))
"Hi!"

Now let's use the substitution model to show that the following always yields x
(car (cons x y))

First we retrieve the body of cons
(lambda (m) (m x y))

We could replace the formal parameters x and y with the arguments 2 and 3 (or any others that we choose) at this point, but I'm going to keep working with x and y. Let's substitute the body of cons.
(car (lambda (m) (m x y)))

Now we can retrieve the body of car and substitute it.
((z (lambda (p q) p)) (lambda (m) (m x y)))

The car procedure takes a procedure z as an argument and applies it to (lambda (p q) p), so there's one more substitution we need to do here before this step is really done. We need to take the second lambda in the expression above and replace z with it.
((lambda (m) (m x y)) (lambda (p q) p))

That might look scary, but it's just a procedure applied to another procedure. Since the procedure on the left takes one formal parameter, we can substitute the procedure on the right for that parameter.
((lambda (p q) p) x y)

Now it should be clear that this expression is a procedure that takes two parameters p and q, and passes two parameters to it. The procedure returns the first of the two parameters passed to it, so this expression simplifies to x.

The definition for cdr that corresponds to the above implementation of car is simply
(define (cdr z)
(z (lambda (p q) q)))

We can test it out the same way we originally tested the code provided in the text,
by running it in the interpreter.
>  (cdr (cons 2 3))
3
> (cdr (cons 15 "Hello"))
"Hello"
> (cdr (cons "Hi!" 42))
42


Related:

For links to all of the SICP lecture notes and exercises that I've done so far, see The SICP Challenge.

76 comments:

Tim Kington said...

Fantastically mind-bending. This kind of thing is the reason SICP is worth working through.

Bill the Lizard said...

Tim,

When I saw this comment in my email I thought for sure you were talking about 2.5. It applies equally well to 2.6.

SICP is definitely making me think in new ways. :)

jie liu said...

it seems that cdr should return a list not the second value in general. But at this point the book only explains pairs.

Mark said...

@jieliu

cdr always returns the second item of a cons cell - sometimes that second item is another cons cell.

valjok said...

I have translated that into Scala, http://valjok.blogspot.com/2014/06/213-what-is-meant-by-data-in-scala.html

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Unknown said...


PureFit Keto
Purefit Keto helps in the utilisation of HDL
HDL is an acronym for high-density lipoprotein and is referred to as worthy cholesterin that makes you better and substantially enhances your vector system. Fix in intellectual when you eat dispose and vulcanised foods your raze of LDL (Low density cholesterin) increases. LDL is bad sterol that module jeopardise your courageousness and also accident havoc on your blood pressing. This is why you poorness more HDL to refrain dangerous issues specified as unhealthiness and ticker comic. HDL is also accommodative in ensuring you are safe from becoming weighty.

Unknown said...

PureFit Keto
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sgopizoity said...


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sgopizoity said...


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doitu cool said...


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koity sioty said...


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stefan jhon said...

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It has been shown that group with lyceum levels of adiponectin were competent to control problems much as type 2 diabetes, blubber, liver disease (non-alcoholic), metabolous syndrome, and others. Ketones also ameliorate relinquishment different substances, titled norepinephrine, which process body temperature, modify up metastasis, and thus help to decline increased fat.
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advrt kolan said...

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giving healthy life said...

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2 types of Operation to handle ACL injuries and both are finished arthroscopically.

1) ACL Ameliorate Surgery:

Arthroscopic ACL better surgery is performed when the musculus is dissolved off from the take (titled as an avulsion). The ligament is reattached to the white and held in station. Restore is sometimes through if the ligament is partially torn. The sawbones sews the ligament posterior unitedly in enjoin to better. However, there is a gymnasium unfortunate rank so in most cases, it is surpass to go for a recall than better.

Alan Baker said...

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alindinx said...

Dr OZ Diet Blog
The researchers discovered that liquor use — particularly in grown-ups who had been consuming for several decades — was associated with enterprise greyish issue volume, as well as enterprise the integrity of white-colored issue.

Marijuana use, however, appeared to have no impact on the dwelling of greyish or white-colored issue in either youngsters or grownups.


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giving healthy life said...


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health said...


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jhon criss said...


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Naturaful said...

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