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Why is Hibernate Open Session in View considered a bad practice?
... is the number of lazy associations. If your screen presents tabular data, reading Hibernate’s log is a big hint that you do not do as you should
this completely defeats layered architecture, since you sully your nails with DB in the presentation layer. This is a conceptual con, so I could live ...
In C#, What is a monad?
There is a lot of talk about monads these days. I have read a few articles / blog posts, but I can't go far enough with their examples to fully grasp the concept. The reason is that monads are a functional language concept, and thus the examples are in languages I haven't worked with (since I haven'...
input() error - NameError: name '…' is not defined
...aluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings.
If you are using Python 3.x, raw_input has been renamed to input. Quoting the Python 3.0 release notes,
raw_input() was r...
How to use unicode characters in Windows command line?
...ole” are unrelated factors. CMD.exe is a just one of programs which are ready to “work inside” a console (“console applications”).
AFAIK, CMD has perfect support for Unicode; you can enter/output all Unicode chars when any codepage is active.
Windows’ console has A LOT of support for ...
Why there is no ForEach extension method on IEnumerable?
...
There is already a foreach statement included in the language that does the job most of the time.
I'd hate to see the following:
list.ForEach( item =>
{
item.DoSomething();
} );
Instead of:
foreach(Item item in list)
{
...
Why should I use the keyword “final” on a method parameter in Java?
...Reassignment
While these answers are intellectually interesting, I've not read the short simple answer:
Use the keyword final when you want the compiler to prevent a
variable from being re-assigned to a different object.
Whether the variable is a static variable, member variable, local vari...
What is the python “with” statement designed for?
...
I believe this has already been answered by other users before me, so I only add it for the sake of completeness: the with statement simplifies exception handling by encapsulating common preparation and cleanup tasks in so-called context managers...
Reshaping data.frame from wide to long format
...er functions.
Another problem with the data is that the values will be read by R as character-values (as a result of the , in the numbers). You can repair that with gsub and as.numeric:
long$value <- as.numeric(gsub(",", "", long$value))
Or directly with data.table or dplyr:
# data.table
...
system(“pause”); - Why is it wrong?
...tinues execution of the program - the console window stays open so you can read the output.
A better idea would be to put a breakpoint at the end and debug it, but that again has problems.
share
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Do you need to dispose of objects and set them to null?
...this scope because it would give a different meaning to 'iVal', which is already used in a 'parent or current' scope to denote something else
}
This makes sense if you look at generated MSIL - all the variables used by the function are defined at the start of the function. Take a look at this func...