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Let Over Lambda, by Doug Hoyte
Ebook Free Let Over Lambda, by Doug Hoyte
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Let Over Lambda is one of the most hardcore computer programming books out there. Starting with the fundamentals, it describes the most advanced features of the most advanced language: Common Lisp. Only the top percentile of programmers use lisp and if you can understand this book you are in the top percentile of lisp programmers. If you are looking for a dry coding manual that re-hashes common-sense techniques in whatever langue du jour, this book is not for you. This book is about pushing the boundaries of what we know about programming. While this book teaches useful skills that can help solve your programming problems today and now, it has also been designed to be entertaining and inspiring. If you have ever wondered what lisp or even programming itself is really about, this is the book you have been looking for.
- Sales Rank: #258987 in Books
- Published on: 2008-04-02
- Original language: English
- Number of items: 1
- Dimensions: 9.02" h x .85" w x 5.98" l, 1.24 pounds
- Binding: Paperback
- 384 pages
Most helpful customer reviews
4 of 4 people found the following review helpful.
Amazing book, if a little hard.
By TeMPOraL
The book is amazing, if the bit chaotic at times. Besides covering lexical closures, lexical, dynamic and other types of scoping, it contains a solid discussion of metaprogramming in general and practical use of Lisp macros. Some of the examples used are pretty mind-bending (in a positive way). I highly recommend it for any serious Lisper.
22 of 23 people found the following review helpful.
Highly Recommended
By Amazon Customer
I haven't finished it, but like another reviewer I am being inspired by this book.
In the first couple of chapters, the author shows examples of assembler, C and Lisp, mostly in preparation for introducing lexical closures.
Closures, it turns out, are generated easily in Lisp by using the construction "let over lambda".
Regarding closures, I agree with the author that most of us have been left "with the inaccurate impression that closures are only good for toy examples like counter." But in fact, "closures are the building blocks of Lisp. Environments, the functions defined inside those environments, and macros like defun that make using them convenient, are all that are needed for modelling any problem." And in fact, the author's aim is "to stop beginning Lisp programmers . . . from . . . reaching for systems like CLOS." Yes, CLOS offers certain things, but ". . . do not use [CLOS] when a lambda will suffice."
If you're like me, you find all this very refreshing and stimulating.
From pages 31-37, the author deftly shows how objects are collections of procedures and associated state, and how the entire object infrastructure is easily derived from the lexical closure, otherwise known as "let over lambda," and combinations of "let over lambda over let over lambda." The ease and power with which this is demonstrated is breath-taking.
A couple of more quotes: "Object systems are a formalisation of a subset of let and lambda combinations, sometimes with gimmicks like inheritance bolted on (footnote 10: Having macros is immeasurably more important than having inheritance.)"
And,
"Once assignable value cells and good old lambda expressions are available, object systems are, at best, occasionally useful abstractions and, at worst, special-case and redundant."
As I indicated, I have not finished the book, but the first couple of chapters have given me plenty to consider. I highly recommend this book.
10 of 12 people found the following review helpful.
A mixed bag. Contains some interesting and worthwhile ideas ...
By Matthew B
A mixed bag. Contains some interesting and worthwhile ideas. Also contains an equal number of broad, unsupported claims and idiosyncratic digressions. I found it interesting as a sort of memoir of how Hoyte thinks about programming, as manifested in his affection for Lisp macros. But he occasionally falls victim to his own tunnel vision. For instance, Hoyte dismisses hygienic macro systems without providing any evidence that he appreciates why they exist. (He's also surely the world’s only Lisp programmer who considers Perl "beautiful.")
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