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What does !! mean in ruby?
Just wondering what !! is in Ruby.
8 Answers
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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...
Loader lock error
...u need to go to menu Debug -> Exceptions, open the Managed Debugging Assistants, find LoaderLock and uncheck
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classical inheritance vs prototypal inheritance in javascript
...ypal inheritance. In fact any object-oriented code you write in JavaScript is a paradigm of prototypal inheritance. JavaScript simply doesn't have classical inheritance. This should clear things up a bit:
Inheritance
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Joins are for lazy people?
I recently had a discussion with another developer who claimed to me that JOINs (SQL) are useless. This is technically true but he added that using joins is less efficient than making several requests and link tables in the code (C# or Java).
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Difference between and
What is the difference between HTML <input type='button' /> and <input type='submit' /> ?
8 Answers
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