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Covariance, Invariance and Contravariance explained in plain English?
Today, I read some articles about Covariance, Contravariance (and Invariance) in Java. I read the English and German Wikipedia article, and some other blog posts and articles from IBM.
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How can I pass arguments to a batch file?
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Five years later, I'm back reading my comment w/ confusion. Seem to have meant "to create a .bat with two parameters, literally type echo echo %1 %2 > test.bat. The test.bat file will have echo %1 %2 in it (you could've also saved it from a text edi...
Creating a daemon in Linux
...fork())
Because PID != SID our process can't take control of a TTY again
Reading the syslog:
Locate your syslog file. Mine is here: /var/log/syslog
Do a: grep firstdaemon /var/log/syslog
The output should be similar to this one:
firstdaemon[3387]: First daemon started.
firstdaemon[3387]: ...
Difference between ref and out parameters in .NET [duplicate]
... that's an additional output for the function (eg int.TryParse) that are already using the return value for something.
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Check if an image is loaded (no errors) with jQuery
...ck the image DOM element for the .complete to make sure the image wasn't already loaded before jQuery could register the events.
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How to assign from a function which returns more than one value?
...ionReturningTwoValues()[[2]] would be sufficient.)
See the cited r-help thread for more examples.
(2) with If the intent is merely to combine the multiple values subsequently and the return values are named then a simple alternative is to use with :
myfun <- function() list(a = 1, b = 2)
lis...
What is the difference between String.slice and String.substring?
...y, and/or looking for short answer scroll to the bottom of the answer, and read the last two lines.if Not in a hurry read the whole thing.let me start by stating the facts:
Syntax:
string.slice(start,end)
string.substr(start,length)
string.substring(start,end)
Note #1: slice()==substring()
What it...
Determining Whether a Directory is Writeable
...ss:
os.access('/path/to/folder', os.W_OK) # W_OK is for writing, R_OK for reading, etc.
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What is the purpose of the reader monad?
The reader monad is so complex and seems to be useless. In an imperative language like Java or C++, there is no equivalent concept for the reader monad, if I am not mistaken.
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How do I get the result of a command in a variable in windows?
...ne numbers from the file
rem ---------
rem This is the file that is being read: You can replace this with %1 for dynamic behaviour or replace it with some command like the first example i gave with the 'CD' command.
set _readfile=test.txt
for /f "usebackq tokens=2 delims=:" %%a in (`find /c /v "" ...