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When to Redis? When to MongoDB? [closed]
... MongoDB doesn't enforce a schema, but I'd like to see a case where someone uses it without a schema...it's all how you define the word schema
– Robbie Guilfoyle
Oct 15 '14 at 19:14
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How to negate a method reference predicate
... you can negate the method reference:
Stream<String> s = ...;
long nonEmptyStrings = s.filter(Predicate.not(String::isEmpty)).count();
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How to count lines in a document?
... that wc -l counts "newlines". If you have a file with 2 lines of text and one "newline" symbol between them, wc will output "1" instead of "2".
– Konstantin
Jul 24 '17 at 14:11
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How do I copy an entire directory of files into an existing directory using Python?
...ng code from a directory that contains a directory named bar (containing one or more files) and a directory named baz (also containing one or more files). Make sure there is not a directory named foo .
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How do I generate a random int number?
.../ creates a number between 0 and 51
If you are going to create more than one random number, you should keep the Random instance and reuse it. If you create new instances too close in time, they will produce the same series of random numbers as the random generator is seeded from the system clock.
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What does the explicit keyword mean?
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The compiler is allowed to make one implicit conversion to resolve the parameters to a function. What this means is that the compiler can use constructors callable with a single parameter to convert from one type to another in order to get the right type fo...
What is the difference between compare() and compareTo()?
...art of the Comparator<T> interface, and the typical use is to define one or more small utility classes that implement this, to pass to methods such as sort() or for use by sorting data structures such as TreeMap and TreeSet. You might want to create a Comparator object for the following:
Mul...
What is the basic difference between the Factory and Abstract Factory Design Patterns? [closed]
... say, IFruit.
With the Abstract Factory pattern, you provide a way for anyone to provide their own factory. This allows your warehouse to be either an IFruitFactory or an IJuiceFactory, without requiring your warehouse to know anything about fruits or juices.
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How can I shuffle the lines of a text file on the Unix command line or in a shell script?
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Perl one-liner would be a simple version of Maxim's solution
perl -MList::Util=shuffle -e 'print shuffle(<STDIN>);' < myfile
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Node.js / Express.js - How does app.router work?
... function(req, res) {
res.send('Hello from route handler');
});
Which one gets sent to a client requesting http://server/test.html? Whichever middleware is given to use first.
If you do this:
app.use(express.static(__dirname + '/public'));
app.use(app.router);
Then the file on disk is served....