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Difference between single and double square brackets in Bash
I'm reading bash examples about if but some examples are written with single square brackets:
6 Answers
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How to check if a json key exists?
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just before read key check it like before read
JSONObject json_obj=new JSONObject(yourjsonstr);
if(!json_obj.isNull("club"))
{
//it's contain value to be read operation
}
else
{
//it's not contain key club or isnull so do this opera...
The cause of “bad magic number” error when loading a workspace and how to avoid it?
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I got that error when I accidentally used load() instead of source() or readRDS().
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Why is there no String.Empty in Java?
...s on it - best to use a StringBuilder (or StringBuffer if you want to be thread-safe) and turn that into a String.
Update
From your comment to the question:
What inspired this is actually
TextBox.setText("");
I believe it would be totally legitimate to provide a constant in your appropriate...
Putty: Getting Server refused our key Error
... sshd_conf:
LogLevel DEBUG3
By looking at the logs I realized that sshd reads the key correctly but rejects it because of the incorrect identifier.
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Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint
...ier, self.constant];
}
@end
build it once again, and now you have more readable output for you:
once you got your id you can simple tap it in your Find Navigator:
and quickly find it:
HOW TO SIMPLE FIX THAT CASE?
try to change priority to 999 for broken constraint.
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What does threadsafe mean?
Recently I tried to Access a textbox from a thread (other than the UI thread) and an exception was thrown. It said something about the "code not being thread safe" and so I ended up writing a delegate (sample from MSDN helped) and calling it instead.
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In a PHP project, what patterns exist to store, access and organize helper objects? [closed]
... static methods.
I know a lot of people do it, approve it and use it. But reading Misko Heverys blog articles (a google testability expert), rereading it and slowly digesting what he says did alter the way I see design a lot.
If you want to be able to test you application, you'll need to adopt a d...
jQuery to retrieve and set selected option value of html select element
...he id's are correct and your dom validates then the following applies:
To Read Select Option Value
$('#selectId').val();
To Set Select Option Value
$('#selectId').val('newValue');
To Read Selected Text
$('#selectId>option:selected').text();
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When to use ref and when it is not necessary in C#
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Short answer: read my article on argument passing.
Long answer: when a reference type parameter is passed by value, only the reference is passed, not a copy of the object. This is like passing a pointer (by value) in C or C++. Changes to ...