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Should I instantiate instance variables on declaration or in the constructor?
...personal "rule" (hardly ever broken) is to:
declare all variables at the start of
a block
make all variables final unless they
cannot be
declare one variable per line
never initialize a variable where
declared
only initialize something in a
constructor when it needs data from
the constructor to do...
IEnumerable vs List - What to Use? How do they work?
...abase table you don't want to copy the entire thing into memory before you start processing the rows.
Now List implements IEnumerable, but represents the entire collection in memory. If you have an IEnumerable and you call .ToList() you create a new list with the contents of the enumeration in memo...
What is the difference between google tag manager and google analytics?
...asons why to use GTM: http://www.lunametrics.com/blog/2014/04/08/8-reasons-start-google-tag-manager/
For Android, A draft implementation is at https://developers.google.com/tag-manager/android/v4/#getting-started
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Moving average or running mean
...ll members equal to 1/N. The numpy implementation of convolve includes the starting transient, so you have to remove the first N-1 points:
def runningMeanFast(x, N):
return np.convolve(x, np.ones((N,))/N)[(N-1):]
On my machine, the fast version is 20-30 times faster, depending on the length o...
Using IoC for Unit Testing
... +1 for the phrase "like pouring cement into your code". I've started using it all the time.
– Andrew Shepherd
Mar 8 '13 at 1:14
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...
Binary Data in JSON String. Something better than Base64
...ncoding is that it makes it robust and possible to locate multi byte chars start and end whatever byte we start looking at.
As a consequence, if encoding a byte value in the range [0..127] would need only one byte in UTF-8 encoding, encoding a byte value in the range [128..255] would require 2 byte...
Which timestamp type should I choose in a PostgreSQL database?
...ecord an event. Examples: "User 123 logged in" or "a graduation ceremonies start at 2011-05-28 2pm PST." Regardless of your local time zone, if you could teleport to where the event occurred, you could witness the event happening. Most time data in a database is absolute (and therefore should be TIM...
Why is it not advisable to have the database and web server on the same machine?
... just the easiest step in scaling..
It's exactly what StackOverflow did - starting with single machine running IIS/SQL Server, then when it started getting heavily loaded, a second server was bought and the SQL server was moved onto that.
If performance is not an issue, do not waste money buying/m...
Pass a parameter to a fixture function
...============================================================= test session starts =================================================================================
platform cygwin -- Python 3.6.8, pytest-5.3.1, py-1.8.0, pluggy-0.13.1 -- /usr/bin/python3
cachedir: .pytest_cache
rootdir: .
collected ...
Managing CSS Explosion
...ood markup, these areas will be identical to the HTML structure.
Then, I start building CSS classes, specifying as much ancestry as possible as long as it is sensible, and grouping related classes as closely as possible.
div.content ul.table_of_contents
div.content ul.table_of_contents li
div.c...