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How are strings passed in .NET?
...hat produce modified versions of the string (substrings, trimmed versions, etc.) create modified copies of the original string.
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MySQL order by before group by
...by clause, or that are not used in an aggregate function (MIN, MAX, COUNT, etc.).
Correct use of extension to GROUP BY clause
This is useful when all values of non-aggregated columns are equal for every row.
For example, suppose you have a table GardensFlowers (name of the garden, flower that gro...
Do sealed classes really offer performance Benefits?
...can use call instead of callvirt as it doesn't have to check for virtuals, etc. As proven above, this is not true.
My next thought was that even though the MSIL is identical, perhaps the JIT compiler treats sealed classes differently?
I ran a release build under the visual studio debugger and view...
I need to securely store a username and password in Python, what are my options?
...B_FILE, 'w') as f:
pickle.dump(db, f)
def retrieve(key):
''' Fetch key-value pair.'''
return decrypt(db[key], getSaltForKey(key))
def require(key):
''' Test if key is stored, if not, prompt the user for it while hiding their input from shoulder-surfers.'''
if not key in db:...
What are type lambdas in Scala and what are their benefits?
..., another concrete type. Give List a String and it gives you List[String]. Etc.
So, List, Option can be considered to be type level functions of arity 1. Formally we say, they have a kind * -> *. The asterisk denotes a type.
Now Tuple2[_, _] is a type constructor with kind (*, *) -> * i.e. y...
Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?
... SIGSEGV + the lib .so name will go a lot farther than the useless code=1, etc... Next think about where your Java app could touch native code, even if it's nothing you're doing. I made the mistake of assuming it was a Service + UI threading issue where the Canvas was drawing something that was null...
Why should text files end with a newline?
...ning how critical it is to end files with an EOL. In C, C++, Java (JARs), etc... some standards will dictate a newline for validity - no such standard exists for JS, HTML, CSS.
For example, instead of using wc -l filename one could do awk '{x++}END{ print x}' filename , and rest assured that the t...
What is the meaning of “non temporal” memory accesses in x86
...
Non-Temporal SSE instructions (MOVNTI, MOVNTQ, etc.), don't follow the normal cache-coherency rules. Therefore non-temporal stores must be followed by an SFENCE instruction in order for their results to be seen by other processors in a timely fashion.
When data is produc...
Redis strings vs Redis hashes to represent JSON: efficiency?
...ws you to store more complicated Objects (with multiple layers of nesting, etc.) Option 3 is used when you really care about not polluting the main key namespace (i.e. you don't want there to be a lot of keys in your database and you don't care about things like TTL, key sharding, or whatever).
If...
Understanding slice notation
...','t','h']
>>> p[2:4] # Take two items off the front
['t','h']
# etc.
The first rule of slice assignment is that since slicing returns a list, slice assignment requires a list (or other iterable):
>>> p[2:3]
['t']
>>> p[2:3] = ['T']
>>> p
['P','y','T','h','o...