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Better way to check variable for null or empty string?
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Beware false negatives from the trim() function — it performs a cast-to-string before trimming, and thus will return e.g. "Array" if you pass it an empty array. That may not be an issue, depending on how you process your data, but with the code you supply, a field named question[] could ...
How to call a method after a delay in Android
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Kotlin
Handler(Looper.getMainLooper()).postDelayed({
//Do something after 100ms
}, 100)
Java
final Handler handler = new Handler(Looper.getMainLooper());
handler.postDelayed(new Runnable() {
@Override
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Developing GUIs in Python: Tkinter vs PyQt [closed]
...te directly to working with Qt in other languages too if you ever need to, and Qt is probably the best cross-platform interface toolkit available right now.
There are only two real (potential) disadvantages:
PyQt is only available under the GPL. This means if you release your code, it has to be a...
Application not picking up .css file (flask/python)
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I have read multiple threads and none of them fixed the issue that people are describing and I have experienced too.
I have even tried to move away from conda and use pip, to upgrade to python 3.7, i have tried all coding proposed and none of them fixed...
How to escape JSON string?
...or a control character will always return "\\u000X". I believe you need to cast the char first to an int. Consider replacing it with string t = "000" + ((int)c).ToString("X");
– Jan Discart
Dec 22 '18 at 19:18
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Is there a simple way to delete a list element by value?
... 3.x, it returns a filter object (in 2.x, it returns a list), so I have to cast "a" to a list for it to have any functionality.
– mathwizurd
Oct 10 '15 at 16:27
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Should I use string.isEmpty() or “”.equals(string)?
...check first to see if they are the same object, then an instanceof, then a cast to String, a length check, and then finally the iteration. If both Strings were empty then it would be just a simple reference check though.
– David Young
Jul 23 '10 at 19:29
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Auto-reload browser when I save changes to html file, in Chrome?
I'm editing an HTML file in Vim and I want the browser to refresh whenever the file underneath changes.
22 Answers
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How to Join to first row
...version here:
select *
from Orders o
cross apply (
select CAST((select l.Description + ','
from LineItems l
where l.OrderID = s.OrderID
for xml path('')) as nvarchar(max)) l
) lines
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IOS7 : UIScrollView offset in UINavigationController
I'm currently migrating my app on ios 7 and I've been stuck for hours on the new navigationcontroller/bar management.
8 Ans...