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Difference between Inheritance and Composition
...e is an "is-a" relationship. Composition is a "has-a".
You do composition by having an instance of another class C as a field of your class, instead of extending C. A good example where composition would've been a lot better than inheritance is java.util.Stack, which currently extends java.util.Vec...
prototype based vs. class based inheritance
...he same state space (read "possible values") and the same operations, thereby forming an equivalence class. If you look back at Smalltalk, since you can open a class and add methods, this is effectively the same as what you can do in Javascript.
Later OO languages wanted to be able to use static t...
Connect to a locally built Jekyll Server using mobile devices in the LAN
...nfig.yml) you'll notice that it's listening on all interfaces (represented by 0.0.0.0) rather than just listening on the loopback interface (represented by 127.0.0.1)
$ jekyll serve --host=0.0.0.0
[...]
Server address: http://0.0.0.0:4000/
Server running... press ctrl-c to stop.
If you still can...
What REST PUT/POST/DELETE calls should return by a convention?
...LIST of resources probably makes the most sense.
Success can be indicated by HTTP_OK, yes.
The only hard-and-fast rule in what I've said above is that a CREATE should return the location of the new resource. That seems like a no-brainer to me; it makes perfect sense that the client will need to b...
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'
... in bash, not at the MySQL command-line.
If you are in mysql, you can exit by typing exit.
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What's the difference between Sender, From and Return-Path?
...tem(s) responsible for the writing of the
message. Defined as standard by RFC 822.
2.1.3. Header Field: Sender
Description:
Mailbox of message sender
[...]
Related information:
Specifies the mailbox of the agent responsible for the actual
transmission of the message. Defined ...
What do 3 dots next to a parameter type mean in Java?
...own at compile time, the restriction to pass at least one element could be bypassed by simply calling someMethod(new SomeType[] { }). That would be a hack, wouldn't it?
– MC Emperor
Jan 2 '18 at 12:51
...
NSObject +load and +initialize - What do they do?
...ze or +load. Documentation makes it clear these methods are called for you by the Objective-C runtime, but that's really all that is clear from the documentation of those methods. :-)
...
Reusing output from last command in Bash
...
You can save yourself from typing $(your_cmd) by using backticks: `your_cmd` According to the Gnu Bash manual they are functionally identical. Of course this is also subject to the warning raised by @memecs
– user2065875
Apr 20 '15 ...
How to train an artificial neural network to play Diablo 2 using visual input?
...ithms specifically (so it's kind of a generalization of the framework used by AlphaGo but to a lot more games). There is a course on Udemy covering the application of machine learning to games like breakout or Doom using OpenAI Gym.
TorchCraft: a bridge between Torch (machine learning framework) and...