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Why does Python code run faster in a function?
... not a local access. It is an attribute of an object. (Forgive the lack of formatting)def foo_func: x = 5, x is local to a function. Accessing x is local. foo = SomeClass(), foo.bar is attribute access. val = 5 global is global. As for speed local > global > attribute according to what I've re...
Java naming convention for static final variables [duplicate]
...
That's still a constant. See the JLS for more information regarding the naming convention for constants. But in reality, it's all a matter of preference.
The names of constants in interface types should be, and final
variables of class types may conventionally be, ...
How can building a heap be O(n) time complexity?
... the correct choice between siftUp and siftDown is critical to get O(n) performance for buildHeap, but does nothing to help one understand the difference between buildHeap and heapSort in general. Indeed, proper implementations of both buildHeap and heapSort will only use siftDown. The siftUp operat...
How do Mockito matchers work?
...istOf(String.class). Because of type erasure, though, Mockito lacks type information to return any value but null for any() or argThat(...), which can cause a NullPointerException if trying to "auto-unbox" a null primitive value.
Matchers like eq and gt take parameter values; ideally, these values s...
What is the difference between the kernel space and the user space?
...el space, and normal programs run in user space. User space is basically a form of sand-boxing -- it restricts user programs so they can't mess with memory (and other resources) owned by other programs or by the OS kernel. This limits (but usually doesn't entirely eliminate) their ability to do bad ...
In what cases could `git pull` be harmful?
...d by incoming changes.
The git pull command is safe so long as it only performs fast-forward merges. If git pull is configured to only do fast-forward merges and when a fast-forward merge isn't possible, then Git will exit with an error. This will give you an opportunity to study the incoming com...
Case objects vs Enumerations in Scala
...ration.Value, thus 1) requiring scala-library, 2) losing the actual type information.
– juanmirocks
Oct 24 '12 at 9:09
7
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Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...lso using an additional thread. As you stated for best overall (system) performance I guess it would be better to use asynchronous I/O and not multiple threads (so reducing thread switching).
Let's look at possible implementations of a network server program that shall handle 1000 clients connected...
How is this fibonacci-function memoized?
...f the versions above are in fact independent of the outer n binding, to perform the lambda lifting after all, resulting in full memoization (except for the polymorphic definitions). In fact that's exactly what happens with all three versions when declared with monomorphic types and compiled with -O2...
How to turn on (literally) ALL of GCC's warnings?
...at's not usually useful is -Wtraditional, which warns about perfectly well formed code that has a different meaning (or doesn't work) in traditional C, e.g. "string " "concatenation", or ISO C function definitions! Do you really care about compatibility with 30 year old compilers? Do you really wan...