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React JSX: selecting “selected” on selected option
In a React component for a <select> menu, I need to set the selected attribute on the option that reflects the application state.
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Keystore type: which one to use?
...a.security of my JRE , I see that the keystore type to use by default is set to JKS . Here , there is a list of the keystore types that can be used.
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Once upon a time, when > was faster than < … Wait, what?
... that the GPU uses a hierarchical depth buffer. Therefor only has to clear set the tile states to clear (which is fast), changing the depth compare sign, however, means that the entire HiZ buffer needs to be flushed because it only stores a min or max value depending on the compare sign.
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How to work with complex numbers in C?
... The expression (complex float) { r, i } can also be used to set the separate parts of the number and independently (allowing the real part to be INF while the imaginary part is NAN, for instance). That avoids the GCC-specific keyword, though I'm not sure if it actually is portable.
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NSInvocation for Dummies?
...ext, you would specify which object to send the message to:
[myInvocation setTarget:myArray];
Specify the message you wish to send to that object:
[myInvocation setSelector:@selector(addObject:)];
And fill in any arguments for that method:
[myInvocation setArgument:&myString atIndex:2];
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The written versions of the logical operators
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Unfortunately, in Visual Studio (as of VS2013), you must set a specific compiler option (/Za) in order to support the alternative keywords (see stackoverflow.com/a/555524/368896). That presumably also has other impacts. So, in Visual Studio, it's not necessarily safe to take this...
Command prompt won't change directory to another drive
...d /d d:\Docs\Java
For more help on the cd command use:
C:\Documents and Settings\kenny>help cd
Displays the name of or changes the current directory.
CHDIR [/D] [drive:][path]
CHDIR [..]
CD [/D] [drive:][path]
CD [..]
.. Specifies that you want to change to the parent di...
How to extract one column of a csv file
... space for any line.
So using BEGIN (Execute before taking input) we can set this field to anything we want...
awk 'BEGIN {FS = ","}; {print $3}'
The above code will print the 3rd column in a csv file.
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Casperjs/PhantomJs vs Selenium
...r encountered) continue to execute the same tests thoroughly in a Selenium setup.
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How to debug Lock wait timeout exceeded on MySQL?
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END OF INNODB MONITOR OUTPUT
============================
1 row in set, 1 warning (0.00 sec)
You should consider increasing the lock wait timeout value for InnoDB by setting the innodb_lock_wait_timeout, default is 50 sec
mysql> show variables like 'innodb_lock_wait_timeout';
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