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What does default(object); do in C#?
... value
For Nullable<T> it returns the empty (pseudo-null) value (actually, this is a re-statement of the first bullet, but it is worth making it explicit)
The biggest use of default(T) is in generics, and things like the Try... pattern:
bool TryGetValue(out T value) {
if(NoDataIsAvailab...
Catch browser's “zoom” event in JavaScript
...th, now I am working on a solution with filtering out resize events, especially on mobile. Anyone?
– lowtechsun
Jan 25 '17 at 0:45
...
Can't Find Theme.AppCompat.Light for New Android ActionBar Support
...;Android. In the section library "Add" and choose "AppCompat"
That is all!
Note: if you are using "android:showAsAction" in menu item, you need to change prefix android as in the example http://developer.android.com/guide/topics/ui/actionbar.html
...
How can I log the stdout of a process started by start-stop-daemon?
...ON_ARGS > /var/log/some.log 2>&1"
Using exec to run the daemon allows stop to correctly stop the child process instead of just the bash parent.
Using --startas instead of --exec ensures that the process will be correctly detected by its pid and won't erroneously start multiple instances...
How do I prevent a parent's onclick event from firing when a child anchor is clicked?
...er catches it.
There are two solutions to this is to check to see who actually originated the event. jQuery passes an eventargs object along with the event:
$("#clickable").click(function(e) {
var senderElement = e.target;
// Check if sender is the <div> element e.g.
// if($(e.ta...
data.frame rows to a list
...ts in your list are atomic vectors, not list as the OP requested. It is usually not a problem until your xy.df contains mixed types...
– Calimo
Feb 28 '14 at 14:40
2
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How to use wait and notify in Java without IllegalMonitorStateException?
...
To be able to call notify() you need to synchronize on the same object.
synchronized (someObject) {
someObject.wait();
}
/* different thread / object */
synchronized (someObject) {
someObject.notify();
}
...
how to create a Java Date object of midnight today and midnight tomorrow?
In my code I need to find all my things that happened today. So I need to compare against dates from today at 00:00am (midnight early this morning) to 12:00pm (midnight tonight).
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How to check for an undefined or null variable in JavaScript?
...
@SharjeelAhmed It is mathematically corrected. NaN from difference equation can never expected to be equal
– Thaina
Oct 4 '19 at 4:12
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How do I programmatically change file permissions?
In Java, I'm dynamically creating a set of files and I'd like to change the file permissions on these files on a linux/unix file system. I'd like to be able to execute the Java equivalent of chmod . Is that possible Java 5? If so, how?
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