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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...
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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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...
How to generate a random string of a fixed length in Go?
...So we don't really need a rand.Rand (either explicit or the global, shared one of the rand package), a rand.Source is perfectly enough for us:
var src = rand.NewSource(time.Now().UnixNano())
func RandStringBytesMaskImprSrc(n int) string {
b := make([]byte, n)
// A src.Int63() generates 63 ...
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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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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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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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....
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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Difference between clustered and nonclustered index [duplicate]
...eed to keep two issues apart:
1) the primary key is a logical construct - one of the candidate keys that uniquely and reliably identifies every row in your table. This can be anything, really - an INT, a GUID, a string - pick what makes most sense for your scenario.
2) the clustering key (the colu...