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Interface naming in Java [closed]
...f you call the interface IUser then every consumer of that class needs to know its an IUser. If you call the class UserImpl then only the class and your DI container know about the Impl part and the consumers just know they're working with a User.
Then again, the times I've been forced to use Impl ...
SQL update fields of one table from fields of another one
...ng the column names?
General solution with dynamic SQL
You don't need to know any column names except for some unique column(s) to join on (id in the example). Works reliably for any possible corner case I can think of.
This is specific to PostgreSQL. I am building dynamic code based on the the inf...
Why did Bootstrap 3 switch to box-sizing: border-box?
...ample: Try putting a 1 pixel border on a 100% width div, with content-box. Now you've got something thats 100% + 2 pixels. With border-box, you don't have that problem, its still 100%.
– emptywalls
Feb 14 '14 at 23:23
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How To Check If A Key in **kwargs Exists?
...: Always just pass-through arguments you don't understand, and don't even know if they exist. If you always pass through *args and **kwargs you make your code slower, and requires a bit more typing, but if interfaces of the called function (in this case print) changes, you don't need to change your ...
What's the difference between unit tests and integration tests? [duplicate]
...o I'd use a mock to mock the database and try to return a filtered list. I now understand that as being an integration test and something that will be picked up by QAs if the database returns New York when asked for cities in the UK. The unit test just tests that the round trip e.g. to the controlle...
What is the difference between exit and return? [duplicate]
... _Exit from #include <stdlib.h>) terminates the process immediately.
Now there are also issues that are specific to C++.
C++ performs much more work than C when it is exiting from functions (return-ing). Specifically it calls destructors of local objects going out of scope. In most cases progr...
Is there a literal notation for an array of symbols?
...
Yes! This is possible now in Ruby 2.0.0. One way to write it is:
%i{foo bar} # => [:foo, :bar]
You can also use other delimiters, so you could also write %i(foo bar) or %i!foo bar! for example.
This feature was originally announced here:
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Is there any difference between GROUP BY and DISTINCT
...s.
For example, if you have a bunch of purchase records, and you want to know how much was spent by each department, you might do something like:
SELECT department, SUM(amount) FROM purchases GROUP BY department
This will give you one row per department, containing the department name and the su...
What is the use of “assert” in Python?
...ch evaluate to their contents. But with assert(False,) the parentheses are now a tuple, and a non-empty tuple evaluates to True in a boolean context.
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(13: Permission denied) while connecting to upstream:[nginx]
...onf
Change ownership to user.
sudo chown -R nginx:nginx /var/lib/nginx
Now see the magic.
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