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Java naming convention for static final variables [duplicate]
... and final
variables of class types may conventionally be, a sequence of one or
more words, acronyms, or abbreviations, all uppercase, with components
separated by underscore "_" characters. Constant names should be
descriptive and not unnecessarily abbreviated. Conventionally they may
be ...
C++ Tuple vs Struct
...out tuple and struct and I write some simple benchmarks with the help from one of my colleague to identify the differences in term of performance between tuple and struct. We first start with a default struct and a tuple.
struct StructData {
int X;
int Y;
double Cost;
std::string L...
In Python, what is the difference between “.append()” and “+= []”?
..., 's = []').timeit()
0.44208112500000141
In general case append will add one item to the list, while += will copy all elements of right-hand-side list into the left-hand-side list.
Update: perf analysis
Comparing bytecodes we can assume that append version wastes cycles in LOAD_ATTR + CALL_FUNCT...
Android: AsyncTask vs Service
...mplish the same task with either an AsyncTask or a Service however usually one is better suited to a task than the other.
AsyncTasks are designed for once-off time-consuming tasks that cannot be run of the UI thread. A common example is fetching/processing data when a button is pressed.
Services a...
Injecting Mockito mocks into a Spring bean
...n this case it will inject mockedObject into the testObject. This was mentioned above but here is the code.
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How do I know if a generator is empty from the start?
... typical implementation doesn't even calculate a value until it is needed. One could force the interface to do this, but that might be sub-optimal for lightweight implementations.
– David Berger
Jan 30 '13 at 20:54
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MYSQL OR vs IN performance
...according to the type of expr and sorted. The search for the item then is done using a binary search. This means IN is very quick if the IN value list consists entirely of constants . Otherwise, type conversion takes place according to the rules described at Type Conversion, but applied to all the ...
Check if string contains only whitespace
...f there are only whitespace characters in the string and there is at least one character, False otherwise.
A character is whitespace if in the Unicode character database (see unicodedata), either its general category is Zs (“Separator, space”), or its bidirectional class is one of WS, B, or S.
...
Is it worth using Python's re.compile?
...ekey = (type(key[0]),) + key
p = _cache.get(cachekey)
if p is not None: return p
# ...
# Does actual compilation on cache miss
# ...
# Caches compiled regex
if len(_cache) >= _MAXCACHE:
_cache.clear()
_cache[cachekey] = p
return p
I still often pre-...
Amazon S3 direct file upload from client browser - private key disclosure
...PI using only JavaScript, without any server-side code. All works fine but one thing is worrying me...
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