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Why is there “data” and “newtype” in Haskell? [duplicate]
...peek inside.
Couldn't the compiler handle this for itself.
No, not really—this is a case where as the programmer you get to decide whether the constructor is strict or lazy. To understand when and how to make constructors strict or lazy, you have to have a much better understanding of lazy ...
Xcode — what is $(SRCROOT)?
...ferent computer, so I need to update some paths. The library search paths all start with $(SRCROOT) . What does that mean?
...
How to capture no file for fs.readFileSync()?
...
Basically, fs.readFileSync throws an error when a file is not found. This error is from the Error prototype and thrown using throw, hence the only way to catch is with a try / catch block:
var fileContents;
try {
fileContents =...
How do I limit the number of rows returned by an Oracle query after ordering?
...You can find the full syntax here. (Also read more on how this works internally in Oracle in this answer).
To answer the original question, here's the query:
SELECT *
FROM sometable
ORDER BY name
OFFSET 20 ROWS FETCH NEXT 10 ROWS ONLY;
(For earlier Oracle versions, please refer to other answers ...
Twitter Bootstrap vs jQuery UI? [closed]
...n several projects.
The biggest difference in my opinion
jQuery UI is fallback safe, it works correctly and looks good in old browsers, where Bootstrap is based on CSS3 which basically means GREAT in new browsers, not so great in old
Update frequency: Bootstrap is getting some great big updates ...
Are PDO prepared statements sufficient to prevent SQL injection?
...
The short answer is NO, PDO prepares will not defend you from all possible SQL-Injection attacks. For certain obscure edge-cases.
I'm adapting this answer to talk about PDO...
The long answer isn't so easy. It's based off an attack demonstrated here.
The Attack
So, let's start off b...
How do I update a Linq to SQL dbml file?
...y in the Properties pane of the DBML. This works for simple changes, like allowing nulls on a field.
The DBML designer is not installed by default in Visual Studio 2015, 2017 or 2019. You will have to close VS, start the VS installer and modify your installation. The LINQ to SQL tools is the feat...
JavaScript: What are .extend and .prototype used for?
...ate ).lol() // alert message
In the snippet above, I define a method for all Date objects ( already existing ones and all new ones ).
extend is usually a high level function that copies the prototype of a new subclass that you want to extend from the base class.
So you can do something like:
e...
ExecuteReader requires an open and available Connection. The connection's current state is Connectin
...n the Connection-Pool's territory
There's a good reason why ADO.NET internally manages the underlying Connections to the DBMS in the ADO-NET Connection-Pool:
In practice, most applications use only one or a few different
configurations for connections. This means that during application
exe...
What is the difference between a symbolic link and a hard link?
... (Or is it multiple inodes? Not sure.)
A file in the file system is basically a link to an inode.
A hard link, then, just creates another file with a link to the same underlying inode.
When you delete a file, it removes one link to the underlying inode. The inode is only deleted (or deletable/ove...