Download Ebook Steps in Scala: An Introduction to Object-Functional Programming, by Christos K. K. Loverdos, Apostolos Syropoulos
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Steps in Scala: An Introduction to Object-Functional Programming, by Christos K. K. Loverdos, Apostolos Syropoulos
Download Ebook Steps in Scala: An Introduction to Object-Functional Programming, by Christos K. K. Loverdos, Apostolos Syropoulos
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Scala is a highly expressive, concise and scalable language. It is also the most prominent method of the new and exciting methodology known as object-functional programming. In this book, the authors show how Scala grows to the needs of the programmer, whether professional or hobbyist. They teach Scala with a step-by-step approach and explain how to exploit the full power of the industry-proven JVM technology. Readers can then dive into specially chosen design challenges and implementation problems, inspired by the trials of real-world software engineering. It also helps readers to embrace the power of static typing and automatic type inference. In addition, the book shows how to use the dual-object and functional-oriented natures combined at Scala's core, and so write code that is less 'boilerplate', giving a genuine increase in productivity.
- Sales Rank: #3699585 in Books
- Brand: Brand: Cambridge University Press
- Published on: 2010-11-08
- Original language: English
- Number of items: 1
- Dimensions: 9.72" h x 1.02" w x 6.85" l, 1.95 pounds
- Binding: Paperback
- 504 pages
- Used Book in Good Condition
Review
"Loverdos and Syropoulos provide a well-constructed introduction to this language."
J. Beidler, University of Scranton for Choice Magazine
About the Author
Christos K. K. Loverdos is a research-inclined computer software professional. He has been working in the software industry for more than ten years, designing and implementing flexible, enterprise-level systems and was a member of the core team that led the design and implementation of the Athens 2004 Olympic Games portal (www.athens2004.com).
Apostolos Syropoulos is a computer scientist. He has been instrumental in the spread of TeX and other related document preparation tools inside and outside Greece and is currently working as a computer educator.
Most helpful customer reviews
47 of 50 people found the following review helpful.
Avoid this book.
By Cody Koeninger
Avoid this book. It is poorly written, poorly edited, and poorly typeset. It contains little information that is not already available in better sources, and the material it does provide is often muddled or incorrect.
The writing is full of asides ("After this brief but necessary explanation, let us continue with our example") and logically faulty statements ("Since the designer of Scala has written two versions of the official Java compiler, Scala's compiler produces output that is as fast and reliable as the output produced by the official Java compiler"). The editor not only failed to trim the bloat, but overlooked errors ranging from merely unfortunate ("additing") to possibly confusing ("Note that, Java programs, Scala programs can be stored in files whose names are different from the name of the class...") to outright wrong (reference to ":/", an operator that does not exist); nor is the extremely sparse index useful in resolving such confusion. The code is often typeset using greek characters for the names of type variables and capital letters for the names of other variables, instead of the idiomatic Scala convention of capital letters for type variables.
These issues might have been forgivable, but the content itself contains many mistakes regarding fundamental aspects of Scala. The authors repeatedly confuse the distinction between val and var with comparisons to constants and variables. A Scala val is not a constant, it is an immutable reference to a (possibly mutable) object, and thinking of it as a constant will leave a programmer wondering why dereferencing a val at two different times can produce two different results. The authors state that "the last 'command' of each clause of a conditional expression must be of the same type...", which is simply untrue:
scala> val x = Set(1,2,3)
x: scala.collection.immutable.Set[Int] = Set(1, 2, 3)
scala> val y = List("a", "b", "c")
y: List[java.lang.String] = List(a, b, c)
scala> val z = if (false) x else y
z: Collection[Any] with (Int) => Any{def toArray[B >: Any]: Array[B]} = List(a, b, c)
The compiler will infer the result type to be a supertype of the two branches. The authors later mention that they have to create an instance of their Stack class as new Stack[Int](3) rather than just new Stack(3), but their class definition as published does not contain a constructor that takes an argument! For that matter, their definition won't compile at all, because it references an exception class that is not defined. Given a proper definition class Stack[T](x: T) ..., the compiler will infer the type of new Stack(3) correctly. The authors botch their explanation of the scope of implicits: leaving out discussion of transitivity, making assertions like "it checks the type of all functions that have been declared as implicit", and reacting to compiler errors regarding implicits by saying "This is really strange..." This confusion extends even to issues of coding style, where the authors recommend that "if a method takes no arguments but returns a value, then one should type the parentheses to designate exactly this." They provide no justification, and completely ignore the issue that by doing this, you lose the ability to later modify your code to replace the runtime calculation with a val without a change to client code.
It is remotely possible that some of these errors are due to the use of an old version of Scala; they mention compiler errors which simply do not happen under 2.7.7 final, and do not make it clear which version they are using at any given time, sometimes mentioning revisions as old as 2.7.4 or svn revisions that seem to be from the 2.7.1 timeframe. Yet they make references to 2.7.7 in the book, so they at least had access to it. For a book published near the same time as the release of 2.8.1, it's unfortunate that the only discussion of 2.8 at all is a passing reference to Traversable.
Perhaps if you've read this far, you're thinking to yourself, "I already know this stuff, and can work around the errors, and they have a section on topic X that I'm interested in, so maybe I can get some value out of it." Don't bet $50 on that. The section on functional graphics consists of a 3/4 page imperative implementation of a couple of graphics routines, and a reader exercise to "Make the code of Figure 6.42 more functional..." The chapters on file systems introduce the idea that paths can been seen as a monoid (in a not-really-at-all kind of way, since an absolute path can't be the right-hand side of an append), then proceed to do nothing at all with that observation. The chapter on the expression problem is less clear than the freely available academic papers on the subject.
This book isn't quite as horrible as something like "Practical O'Caml", but there's not much reason for it to even exist, much less be worthy of a purchase. It offers little to recommend itself over the only truly high-quality book on Scala (by Odersky, Spoon and Venners), and contains many traps for the unwary.
26 of 28 people found the following review helpful.
A Bizarre and Misleading Book.
By pF
Just one example.
On page 31 to illustrate boolean expressions "Steps In Scala" gives us this putative interaction with the interpreter:
"""
scala> 'A' != 'A'
res12: Boolean = true
"""
What? It's true that 'A' is not equal to 'A'? Surely not!
Could it be a misprint? Well, no, because that text is immediately followed by this "exercise":
"""
Exercise 2.6: Why do you think that the last comparison does not evaluate to false?
"""
Pity the poor newbie who spends days trying to understand this.
Try this example yourself in the interpreter, though, and you get the expected result:
scala> 'A' != 'A'
res0: Boolean = false
scala>
2 of 3 people found the following review helpful.
The worst Scala book on the market...
By Christoph Seufert
I am sure will get a offending answer by Mr. Syropoulos too, like all the 1 Star reviewers before.
The book is badly written in every regard.
The poor quality of the book starts on page 5: So much crap in such a small sample (IntStack):
- Line 2: Why is S a var and not a val?
- Line 3: Why does the statement finish with a semicolon, the one before not (btw. what are those 'commands' the authors always write about? You mean Procedure? Statement? C'mon please use the established vocaulary!)
- Line 4: An unused, not initialized var TopElement is introduced.
- Line 2-4: 2 of the vars you start with a capital letter, 1 not. Why?
- Line 9: What is the return Type "Q"? Will obviously not compile that way.
So many stupidities in such a primitive sample. The use of the semicolons at all hint that the authors weren't even familiar with Scala when starting to write the book.
The writing style is confusing and unstructured. No concept is is clearly introduced. Stupid exercises like E2.20. Why all those while loops (or "commands" - in the authors words) in 2.10? Mattern matching isn't clearly introduced just spread all over the place. Somewhen later (3.2) it's somehow explained by repeating all the samples from before... Why not explain a concept first and then using it? Nothing is expressed precisely ("functions in scala are modules..."? WTF? Why use a word that was never introduced. And as author shows later is wrong).
Also all the greek letters in the code samples are not funny. Just bad style.
Here and there it get's a little better in the book. Ch. 4 (Parser builders) is not that bad, but ends with a totally useless subchapter "monadic parsers": Nothing explained, just thrown at the readers head.
What we learn about Scala in in the chapter about Java Swing may forever be a secret of the authors.
Overall: The book is a pain to read.
So if you want to learn Scala, go for the Odersky Book or for Scala in Action. Or you read the "Scala by example" from the Scala homepage (warning: like Odersky's book and the steps in scala it's little outdated). Scala in Action on the other hand is up to date.
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