Functional Programming in Java, Second Edition (Pragmatic Bookshelf)
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Just some thoughts on being hard on exceptions in functional languages.
On p. 167 we read:
Functional style code is amazing, concise, ...
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As for FinanceData on page 91, the code for AirportInfo uses the suspect and soon-to-be-deprecated java.net.URL. Let’s use java.net.URI i...
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It turns out that Try<T> can be ameliorated by judicious application of subclassing: no need to distinguish by actual type in the s...
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Nothing surprising here, just adapting the form to the other examples.
Ah yes, compute() now returns an immutable list in all cases.
pa...
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The filter stream operation appears on several places in Chapter 2 and Chapter 3, so it’s difficult to say where to put this, but there s...
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I have been thinking about how to collect “two adjacent elements” in a stream, for example transform a stream of Long into a stream of Pa...
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Suggestions for some JUnit test improvements in Refactoring the Traditional “for” loop p 181 ff
Below code for testing the original/cla...
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We read:
We are using the amazing feature of the switch expression of Java [Java 12]. If you’re using an older version of Java, you may...
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A question to highlight is:
Is there a way to make sure that a stream is NOT parallel, and make this evident in the code?
As in:
strea...
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As traditional , the “impure” code of page 207 in the form of a pretend test.
(Doesn’t “impure” refer to performing uncontrolled side ef...
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Although now aged by 34 years:
“The Conception, Evolution, and Application of Functional Programming Languages”
by Paul Hudak (1989-09-...
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I had real trouble understanding the “memoizer”, I suppose Java syntax does not help in thinking about what should be a one-liner in Lamb...
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As usual, but the original code to be refactored was just too evil and had to be fixed.
package chapter11;
import org.junit.jupiter.api...
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The same remarks apply as for “Refactoring the Traditional for Loop”
No init()
Classes under test implement a common interface that is...
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Nothing special here, same changes as formerly, but we are using people.isEmpty() instead of people.size() == 0 for even better legibilit...
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The same remarks apply as for “Refactoring the Traditional for Loop”
No init()
Negative tests which apply for input less than 1900, res...
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In this code:
We actually create the (temporary) file we want to read and delete it again at the end.
Default charsets for reading text...
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The example on page 125 comes closest to the mythical “self-modifying code” (a completely useless concept as modifying the data structure...
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We read:
public static void betterWay() {
List<File> files =
Stream.of(new File(".").listFiles())
.flatMap(file ...
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Again, some code suggestions for “Chapter 4”, similar to “Chapter 3”
(one would wish to have better markdown syntax highlighting to make...
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Suggesting a text change:
We read:
We’ve registered a WatchService to observe any change to the current directory.
but what actually...
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The usual changes but:
The “FirstRepeatedLetter.findIn()” has been improved out of the box. In particular returning ‘\0’ is too C-like ...
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On page 103, the code for FluentMailer provides a static method which is basically a service that (opaquely) instantiates a FluentMailer,...
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In Chapter 9, p.164 the stream is parallelized in 1 step.
This inspired my to write some test some code to call a task “in parallel”:
...
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On page 55, we see Compare.java
final Function<Person, String> byName = person -> person.getName();
people.stream()
.sorted(...
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This is no particular interest but here is some code that uses the “execute around” pattern to build a timer to time the “primes generato...
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On page 15, we read:
In this example we’re sending a function, price -> price * 0.9, as an argument to mapToDouble The function bein...
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I suggest this nicer code for the Statistics.java on page on page 70 (we are doing streams after).
Not using a main() but a JUnit 5 Test...
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This may be too extensive to change, but I would like to see the code example not as a series of classes with main() but as JUnit test cl...
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The text says “oldest” but the code says “eldest”.
Not that it is of much importance.
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Book Info
Publisher:
Pragmatic Bookshelf
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