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Can someone explain the traverse function in Haskell?
...
Let's use Maybe as Applicative and list as Traversable. First we need the transformation function:
half x = if even x then Just (x `div` 2) else Nothing
So if a number is even, we get half of it (inside a Just), else we get Nothing. If everything goes "well", it looks like this:
traverse half [...
What is referential transparency?
...apital since 1999 and that capital is Edinburgh.
This sentence cannot be transformed to a nutty one. Problem solved! The point of Quine was to say that natural language is messy, or at least complicated, because it is made to be convenient for practical use, but philosophers and logicians should...
JPA : How to convert a native query result set to POJO class collection
...eter("userId", userId)
.unwrap(org.hibernate.Query.class).setResultTransformer(Transformers.aliasToBean(JobDTO.class)).list();
The usage is for JPA-Hibernate implementation.
share
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improv...
Using a strategy pattern and a command pattern
...not the best, but good example of strategy is one connected with javax.xml.transform.Source interface: depending on whether the passed object is DOMSource or SAXSource or StreamSource the strategy (= XSLT transformer in this case) will apply different rules to process it. The implementation can be a...
How to replace captured groups only?
...t to replace the capture groups using the capture group as a basis for the transformation? Is there an equally elegant solution to doing this? Currently I store the captured groups in a list, loop them, and replace the capture group with the transformed value at each iteration
–...
What is the difference between declarative and imperative programming? [closed]
... Agreeing with Juanjo and zenna - a loop construct does not magically transform into a declarative program when refactored into a shorter notation.
– Felix Frank
Jun 14 '14 at 21:29
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lexers vs parsers
... CNF has hardly anything to do with the topic at hand. EBNF can easily be transformed into standard BNF. Period. It is syntactic sugar for standard BNF.
– babou
Jun 11 '14 at 12:35
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Pandoc markdown page break
... solution when targeting other formats is to use a pandoc filter which can transform the internal document representation such that it suites our needs. Pandoc 2.0 and later even allows to use the included Lua interpreter to perform this transformation.
Let's assume we are indicating page breaks by...
Javascript reduce on array of objects
... fact, map and filter can both be implemented as reductions:
const map = (transform, array) =>
array.reduce((list, el) => list.concat(transform(el)), []);
const filter = (predicate, array) => array.reduce(
(list, el) => predicate(el) ? list.concat(el) : list,
[]
);
I hope this ...
How to read XML using XPath in Java
...on | ParserConfigurationException | XPathExpressionException
| TransformerException e) {
e.printStackTrace();
}
}
private static String nodeToString(Node node) throws TransformerException {
StringWriter buf = new StringWriter();
Transformer xform = TransformerFactory...