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Should it be “Arrange-Assert-Act-Assert”?
...self, since I find it more correct to write a specific test that validates whatever precondition I feel the need to ensure. Such a test should always fail if the precondition fails, and this means that I don't need it embedded in all the other tests. This gives a better isolation of concerns, since ...
Slicing of a NumPy 2d array, or how do I extract an mxm submatrix from an nxn array (n>m)?
...2,0:2], the resulting object will share the underlying buffer with x. But what happens if you acces y[i,j]? NumPy can't use i*y.shape[1]+j to calculate the offset into the array, because the data belonging to y is not consecutive in memory.
NumPy solves this problem by introducing strides. When ...
What is the difference between using IDisposable vs a destructor in C#?
...hat description is that MS gives examples of unmanaged resources, but from what I've seen never actually defines the term. Since managed objects are generally only usable within managed code, one might think things used in unmanaged code are unmanaged resources, but that's not really true. A lot o...
Want to find records with no associated records in Rails
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Just imagine you have 10000000 records in friends table. What about performance in that case?
– goodniceweb
Dec 20 '16 at 14:51
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What is the purpose of a stack? Why do we need it?
...vember 18th 2011. Thanks for the great question!
I've always wondered: what is the purpose of the stack?
I assume you mean the evaluation stack of the MSIL language, and not the actual per-thread stack at runtime.
Why is there a transfer from memory to stack or "loading?" On the other ha...
What is the maximum number of characters that nvarchar(MAX) will hold?
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really? That's cool. Just out of curiosit, in what case would you not want to use nvarchar(MAX)?
– quakkels
Nov 24 '10 at 18:39
5
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What is the gain from declaring a method as static
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1. Declaring method static gives slight performance benefit, but what is more useful, it allows using it without having an object instance at hand (think of for example about factory method or getting a singleton). It also serves the documentational purpose of telling the nature of the met...
What is the difference between a symbolic link and a hard link?
...e hard and soft links:
$ ln foo foo-hard
$ ln -s bar bar-soft
Let's see what just happened:
$ ls -l
foo
foo-hard
bar
bar-soft -> bar
Changing the name of foo does not matter:
$ mv foo foo-new
$ cat foo-hard
Cat
foo-hard points to the inode, the contents, of the file - that wasn't change...
Pointers in Python?
...are involved, so the subtlety you crave could be introduced in many ways. What other attributes is form.field suppose to have, for example, besides value? Without that further .value computations, possibilities would include:
class Form(object):
...
def __getattr__(self, name):
retur...
How to get back to the latest commit after checking out a previous commit?
...vious version of the code to examine or test. I have seen instructions on what to do if I wish to modify previous commits -- but suppose I make no changes. After I've done e.g. git checkout HEAD^ , how do I get back to the tip of the branch?.. git log no longer shows me the SHA of the latest co...