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What are the differences between Abstract Factory and Factory design patterns?
...ry is an object. I think a lot of people get these two terms confused, and start using them interchangeably. I remember that I had a hard time finding exactly what the difference was when I learnt them.
Because the factory method is just a method, it can be overridden in a subclass, hence the second...
What is difference between functional and imperative programming languages?
...
Here is the difference:
Imperative:
Start
Turn on your shoes size 9 1/2.
Make room in your pocket to keep an array[7] of keys.
Put the keys in the room for the keys in the pocket.
Enter garage.
Open garage.
Enter Car.
... and so on and on ...
Put the milk ...
Isn't it silly that a tiny favicon requires yet another HTTP request? How can I put the favicon into
...o 20x20 and x,y positions to -1,15.5 I would say this is the playground to start from when using Emoji characters: href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'><rect width='100%' height='100%' fill='hotpink'/><text x='-1' y='15.5' stroke='red'&g...
Set every cell in matrix to 0 if that row or column contains a 0
...question. I wouldn't post a question on sorting and expect an answer which started "assuming you only want to sort 8 things...".
That said, it's a reasonable approach if you know that N is in fact restricted to 8. My answer above answers the original question which has no such retriction.
...
C# vs C - Big performance difference
...not within the loop itself!
What is also missing in the statistics is the startup and cleanup times which are not included in the timings. C# applications tend to spend a lot more time on start-up and on termination than C++ applications. The reason behind this is complicated and has to do with the...
Who is “us” and who is “them” according to Git?
...which can be found with git merge-base master feature_branch), and THEN it starts cherry-picking commits from feature_branch, one-at-a-time, onto this merge-base, thereby "rebasing" feature_branch onto the latest master. Therefore, "us" = HEAD, but since git did a new checkout behind-the-scenes to p...
How can I handle time zones in my webapp?
...ately return your search results without asking for user input, unless you start using some sort of location detection like gmaps does, but that isn't reliable. So you'll need to ask for timezone every time to make sure the user knows what he is entering in the website.
If you do have timezone inf...
How do I work with a git repository within another repository?
...
The key is git submodules.
Start reading the Submodules chapter of the Git Community Book or of the Users Manual
Say you have repository PROJECT1, PROJECT2, and MEDIA...
cd /path/to/PROJECT1
git submodule add ssh://path.to.repo/MEDIA
git commit -m "A...
What's the difference between SoftReference and WeakReference in Java?
...are no strong
references to the widget) that
weakWidget.get() suddenly starts
returning null.
...
Soft references
A soft reference is exactly like a
weak reference, except that it is less
eager to throw away the object to
which it refers. An object which is
only weakly r...
INNER JOIN ON vs WHERE clause
...h much more confusing, hard to read, and hard to maintain once you need to start adding more tables to your query. Imagine doing that same query and type of join on four or five different tables ... it's a nightmare.
Using an explicit join (your second example) is much more readable and easy to mai...