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What is the difference between Strategy design pattern and State design pattern?
...do run across hybrids that have mixes of both. Whether a particular one is more State-y or Strategy-y is ultimately a subjective question.
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I lose my data when the container exits
... @Unferth what if I want to keep committing changes? So far it creates more images with <none>. How do I keep appending the commit on top of an existing image?
– Marconi
Mar 2 '14 at 4:15
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Is 0 a decimal literal or an octal literal?
... point being that a decimal-literal is a nonzero-digit followed by zero or more digit so there is no ambiguity.
– CB Bailey
Aug 1 '11 at 7:53
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How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
...ionary.
Select a DB connection (add one if none).
Click Next.
Check one or more schema names.
Click Next.
Check one or more objects to import.
Click Next.
Click Finish.
The ERD is displayed.
Export the diagram as follows:
Click File → Data Modeler → Print Diagram → To Image File.
Browse t...
Why would a static nested interface be used in Java?
...
@Pacerier: no. More precisely, you can load the class and inspect its members, but cannot instantiate it or call methods on it without using setAccessible(true). In other words it is visible, but not accessible, via reflection. But if the n...
Abusing the algebra of algebraic data types - why does this work?
...e distinguished even if their types are the same. For what it's worth, the more common term is simply "sum type".
Singleton types are, effectively, all unit types. They behave identically under algebraic manipulations and, more importantly, the amount of information present is still preserved.
You p...
How do I load a PHP file into a variable?
...ing on your needs, you could probably use eval() or if you're dealing with more complicated code: github.com/nikic/PHP-Parser.
– Alix Axel
Sep 10 '12 at 9:42
2
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MySQL, better to insert NULL or empty string?
...NULL you can distinguish between "put no data" and "put empty data".
Some more differences:
A LENGTH of NULL is NULL, a LENGTH of an empty string is 0.
NULLs are sorted before the empty strings.
COUNT(message) will count empty strings but not NULLs
You can search for an empty string using a bound...
Join/Where with LINQ and Lambda
...'re familiar with SQL syntax, using the LINQ query syntax is much clearer, more natural, and makes it easier to spot errors:
var id = 1;
var query =
from post in database.Posts
join meta in database.Post_Metas on post.ID equals meta.Post_ID
where post.ID == id
select new { Post = post, ...
Why are variables “i” and “j” used for counters?
... That's a good question. I actually think that "i" might come from integer more than index. I also think it's easy to write on a chalkboard. Back in the 70's we were cautioned to be sure that we wrote our "i" and "j" in a perfectly distinctive manner. Indeed, we were told to draw our "i" exactly ...