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Why are side-effects modeled as monads in Haskell?
...ld -> ((), RealWorld)
We want to
get a filename from the console,
read that file, and
print that file's contents to the console.
How would we do it if we could access the real world states?
printFile :: RealWorld -> ((), RealWorld)
printFile world0 = let (filename, world1) = getLine wor...
Why use JUnit for testing?
...ts, poring over millions of log lines across dozens of files and machines, reading generated and delivered emails, checking text messages, checking the path of a robot, filling a bottle of soda, aggregating data from a hundred web services, checking the audit trail of a financial transaction... you...
Difference between open and codecs.open in Python
.../docs.python.org/3.4/library/io.html
Now, for the original question: when reading text (including "plain text", HTML, XML and JSON) in Python 2 you should always use io.open() with an explicit encoding, or open() with an explicit encoding in Python 3. Doing so means you get correctly decoded Unicod...
How to use Elasticsearch with MongoDB?
...host" : "127.0.0.1:27017" } ] }
rs.initiate(config)
rs.slaveOk() // allows read operations to run on secondary members.
Now install Elasticsearch. I'm just following this helpful Gist.
Make sure Java is installed.
sudo apt-get install openjdk-7-jre-headless -y
Stick with v1.1.x for now until t...
How to set environment variables in Python?
... only the way your program's children run. True, your program can set and read back environment variables, but only from the environment it configures for its children. See also: change current process environment. So far I haven't found a way for a Python script to modify its parent env.
...
std::unique_lock or std::lock_guard?
...ch needs mutual exclusion (e.g. open the same
file in multiple threads).
*/
//mutex is automatically released when lock goes out of scope
};
To clarify a question by chmike, by default std::lock_guard and std::unique_lock are the same.
So in the above case, yo...
PHP Session Fixation / Hijacking
...ssion Fixation and hijacking and how to prevent these problems. I've been reading the following two articles on Chris Shiflett's website:
...
SCOPE_IDENTITY() for GUIDs?
...inserted.GuidColumn
VALUES(1)
The example above is useful if you want to read the value from a .Net client. To read the value from .Net you would just use the ExecuteScalar method.
...
string sql = "INSERT INTO GuidTest(IntColumn) OUTPUT inserted.GuidColumn VALUES(1)";
SqlCommand cmd = new SqlCom...
Assignment in an if statement
...s though. It's not terribly unusual for me to do it in a while though when reading streams of data. For example:
string line;
while ((line = reader.ReadLine()) != null)
{
...
}
These days I normally prefer to use a wrapper which lets me use foreach (string line in ...) but I view the above as...
How to convert timestamps to dates in Bash?
...]]
then
if [[ -p /dev/stdin ]] # input from a pipe
then
read -r p
else
echo "No timestamp given." >&2
exit
fi
else
p=$1
fi
date -d "@$p" +%c
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