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How does push notification technology work on Android?
...implemented their push notification feature? Does it work through polling done by a service running in the background or in a different way?
...
cartesian product in pandas
...
So to do this properly one has to first find an unused column name, then add dummy columns with that name, merge, and finally drop the column on the result? Creating, as opposed to reading, data with pandas is just a pain
– Ba...
What is the point of interfaces in PHP?
...ses?
To prevent multiple inheritance (can cause multiple known problems).
One of such problems:
The "diamond problem" (sometimes referred to as the "deadly diamond of
death") is an ambiguity that arises when two classes B and C inherit
from A and class D inherits from both B and C. If there...
NodeJS / Express: what is “app.use”?
...ll add onto your Express middleware stack. Middleware layers can be added one by one in multiple invocations of use, or even all at once in series with one invocation.
See use documentation for more details.
To give an example for conceptual understanding of Express Middleware, here is what my app...
How does Dijkstra's Algorithm and A-Star compare?
...
Great answer for anyone that knows heuristics ;)
– lindhe
May 19 '15 at 8:44
1
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Difference between Bridge pattern and Adapter pattern
...pattern example, imagine if you had a few implementations of a data store: one is efficient in space, the other is efficient in raw performance... and you have a business case for offering both in your app or framework.
In terms of your question, "where I can use which pattern," the answer is, wher...
What is a mixin, and why are they useful?
...ou want to provide a lot of optional features for a class.
You want to use one particular feature in a lot of different classes.
For an example of number one, consider werkzeug's request and response system. I can make a plain old request object by saying:
from werkzeug import BaseRequest
class...
How do I perform an insert and return inserted identity with Dapper?
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@MarcGravell: Wow! Great Marc, that's a good one! I didn't realize that scope_identity return type is numeric(38,0). +1 a really good find. Never though of it really and I'm sure I'm not the only one.
– Robert Koritnik
Nov 26 '11 a...
Java Enum definition
...eric in both the builder and the message. I'm pretty sure I wouldn't have gone down that route if I hadn't needed it though :)
– Jon Skeet
Mar 22 '12 at 6:45
1
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git mv and only change case of directory
...lapsing the 2 commits. You can just move the file in the index, but to someone that is new to git, it may not be explicit enough as to what is happening. The shorter version is
git mv foo foo2
git mv foo2 FOO
git commit -m "changed case of dir"
As suggested in one of the comments, you can also do...