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When should we use Observer and Observable?
...t the event occurred.
Think Twitter. When you say you want to follow someone, Twitter adds you to their follower list. When they sent a new tweet in, you see it in your input. In that case, your Twitter account is the Observer and the person you're following is the Observable.
The analogy might...
Checking in of “commented out” code [closed]
...ow you'd enforce that anyway). What I will say is that you should get everyone on your team to buy in to the philosophy I described above. The team I work on embraces it wholeheartedly. As a result, source control is a frictonless team-member, one that helps us get our job done.
People who don't em...
SQLite UPSERT / UPDATE OR INSERT
...o upgrade, you are strongly encouraged to do so as unlike my solution, the one posted here achieves the desired behavior in a single statement. Plus you get all the other features, improvements and bug fixes that usually come with a more recent release.
...
When should I use double or single quotes in JavaScript?
...
@Cerebrus - I think flexibility is OK with this one. Sure pick a preferred style, but if you need to break away from the style to save escaping lots of quotes in one string. I'd be OK with that.
– Martin Clarke
May 2 '09 at 8:11
...
Split string into an array in Bash
...e over the elements:
for element in "${array[@]}"
do
echo "$element"
done
To get both the index and the value:
for index in "${!array[@]}"
do
echo "$index ${array[index]}"
done
The last example is useful because Bash arrays are sparse. In other words, you can delete an element or add a...
Class with single method — best approach?
...erforming the function, it can be destroyed. Is there any reason to prefer one of these approaches?
15 Answers
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send mail from linux terminal in one line [closed]
...linux to send emails via command line. How can I send an simple email with one line from the terminal though?
7 Answers
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Serialize an object to string
...() instead of typeof(T) in XmlSerializer constructor: if you use the first one the code covers all possible subclasses of T (which are valid for the method), while using the latter one will fail when passing a type derived from T.
Here is a link with some example code that motivate this stateme...
How do the Proxy, Decorator, Adapter, and Bridge Patterns differ?
...ions.
Facade is a higher-level (read: simpler) interface to a subsystem of one or more classes. Suppose you have a complex concept that requires multiple objects to represent. Making changes to that set of objects is confusing, because you don't always know which object has the method you need to ca...
Git and Mercurial - Compare and Contrast
...an two parents), nor tagging non-commit objects.
Tags: Mercurial uses versioned .hgtags file with special rules for per-repository tags, and has also support for local tags in .hg/localtags; in Git tags are refs residing in refs/tags/ namespace, and by default are autofollowed on fetching and requir...