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What is the most frequent concurrency issue you've encountered in Java? [closed]
...amiliar with the intricacies of the Java Memory Model mess this up all the time.
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Node package ( Grunt ) installed but not available
...mmand line tools are not included with the latest version of Grunt (0.4 at time of writing) instead you need to install them separately.
This is a good idea because it means you can have different versions of Grunt running on different projects but still use the nice concise grunt command to run th...
Java 8: performance of Streams vs Collections
...p writing benchmarking code by hand, use JMH.
Proper benchmarks:
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@BenchmarkMode(Mode.AverageTime)
@OperationsPerInvocation(StreamVsVanilla.N)
public class StreamVsVanilla {
public static final int N = 10000;
static List<Integer> sourceList = ne...
Random number generator only generating one random number
...
Every time you do new Random() it is initialized using the clock. This means that in a tight loop you get the same value lots of times. You should keep a single Random instance and keep using Next on the same instance.
//Function ...
Scala Doubles, and Precision
...h floor n * s) / s }
Similar can be done for the rounding function, this time using currying:
def roundAt(p: Int)(n: Double): Double = { val s = math pow (10, p); (math round n * s) / s }
which is more reusable, e.g. when rounding money amounts the following could be used:
def roundAt2(n: Doub...
List of standard lengths for database fields
...t have business rules, such as "a person can only have one legal name at a time, but multiple pseudonyms at a time".
Some examples:
names: [
{
type:"POLYNYM",
role:"LEGAL",
given:"George",
middle:"Herman",
moniker:"Babe",
surname:"Ruth",
generation:"JUNIOR"
},
{
...
Tying in to Django Admin's Model History
...try.objects.exclude(change_message="No fields changed.").order_by('-action_time')[:20]
logCount = LogEntry.objects.exclude(change_message="No fields changed.").order_by('-action_time')[:20].count()
return render(request, template, {"logs":logs, "logCount":logCount})
As seen in the above c...
C++ Tuple vs Struct
...// print(data);
}
Performance results collected with clang-4.0.0
Celero
Timer resolution: 0.001000 us
-----------------------------------------------------------------------------------------------------------------------------------------------
Group | Experiment | Prob. Space ...
What is so bad about singletons? [closed]
...r test rather difficult in many cases.
They carry state around for the lifetime of the application. Another hit to testing since you can end up with a situation where tests need to be ordered which is a big no no for unit tests. Why? Because each unit test should be independent from the other.
...
How can you detect the version of a browser?
...ontain my own browser detect script, but I found that I do not have enough time to keep it up to date. Therefore I removed it."
– Neolisk
Aug 24 '16 at 17:37
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