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Generator Expressions vs. List Comprehension
When should you use generator expressions and when should you use list comprehensions in Python?
9 Answers
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Synchronization vs Lock
... to avoid using bare Locks in the first place, and just go with a more sophisticated concurrency control such as a CyclicBarrier or a LinkedBlockingQueue, if they meet your needs.
I've never had a reason to use wait() or notify() but there may be some good ones.
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How to select different app.config for several build configurations
...But the tests fail, because I need to tweak some settings in app.config. This is why I was thinking to have a separate second app.config file that will hold the settings for CI server.
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How to output in CLI during execution of PHP Unit tests?
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UPDATE
Just realized another way to do this that works much better than the --verbose command line option:
class TestSomething extends PHPUnit_Framework_TestCase {
function testSomething() {
$myDebugVar = array(1, 2, 3);
fwrite(STDERR, print_r($...
What does !! mean in ruby?
Just wondering what !! is in Ruby.
8 Answers
8
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Creating a “logical exclusive or” operator in Java
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Java does have a logical XOR operator, it is ^ (as in a ^ b).
Apart from that, you can't define new operators in Java.
Edit: Here's an example:
public static void main(String[] args) {
boolean[] all = { false, true };
for (boolean a : all) {
for (...
How to check if an array value exists?
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Using if?
if(isset($something['say']) && $something['say'] == 'bla') {
// do something
}
Btw, you are assigning an value with the key say twice, hence your array will result in an array with only one value.
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What's “tools:context” in Android layout files?
Starting with a recent new version of ADT, I've noticed this new attribute on the layout XML files, for example:
9 Answers
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How do I run a batch file from my Java Application?
... file to specify the program that executes it. Double-clicking in Windows is performed by Windows Explorer. CreateProcess does not know anything about that.
Runtime.
getRuntime().
exec("cmd /c start \"\" build.bat");
Note: With the start \"\" command, a separate command window will be ope...
Is there any way to ignore INSTALL_FAILED_VERSION_DOWNGRADE on application install with the Android
It seems like the most recent Android 4.2 has introduced this error condition on installation when one attempts to install an APK with a lower version. In prior versions of Android, one would be able to install older APK's simply via adb install -r <link to APK> . For debugging purposes, I f...