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What is the right way to check for a null string in Objective-C?
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Refer to the following related articles on this site:
Is if (variable) the same as if (variable != nil) in Objective-C
h
I think your error is related to something else as you shouldn't need to do the extra checking.
Also see this related question: Proper checking of ...
What does .SD stand for in data.table in R
...ed as a list where each element is a column -- thus, sapply/lapply applies FUN to each column and returns the result as sapply/lapply usually would (here, FUN == is.character returns a logical of length 1, so sapply returns a vector).
The syntax to convert these columns to factor is very similar --...
Remove blue border from css custom-styled button in Chrome
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Doing this is not recommended as it regresses the accessibility of your site; for more info, see this post.
That said, if you insist, this CSS should work:
button:focus {outline:0;}
Check it out or JSFiddle: http://jsfiddle.net/u4pXu/
Or in this snippet:
button.launch {
background-colo...
How do detect Android Tablets in general. Useragent?
I have looked everywhere. We are using a Motorola Zoom to try our tablet site testing.
The issue is that the Android Useragent is a general Useragent and there is no difference between tablet Android and mobile Android. I don't want to just target a specific device like the Xoom Useragent since And...
Open URL under cursor in Vim with browser
...to anything you want.
Original answer:
Don't remember where I get this function. There is a bug with hash (#) in the url, but the function works well enough that I won't bother fixing it.
function! HandleURL()
let s:uri = matchstr(getline("."), '[a-z]*:\/\/[^ >,;]*')
echo s:uri
if s:ur...
Setting Django up to use MySQL
...ined by #Andy and at the last execute :
python manage.py runserver
Have fun..!!
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Test if something is not undefined in JavaScript
...defined", instead of a useful message about an "un-caught exception @ line 123 of file xyz.js". Eventually a second developer will probably comment out the console.log() statement, making it more difficult for a 3rd developer to come in and fix a bug happening deep within doSomething().
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Application Crashes With “Internal Error In The .NET Runtime”
...ror Reporting entry in the event log following the crash entry.
Then, have fun with WinDbg !
The latest documentation on the use of the <gcConcurrent/> configuration element, to disable concurrent or (in .NET 4 and later) background garbage collection, can be found here.
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站长投放广告绝对不做的事:Google Adsense和百度联盟广告违规分析 - 更多技...
...是非常不利的。
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How do you find out the type of an object (in Swift)?
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Fun fact. This does not work with implicitly unwrapped optionals! i.e. var myVar: SomeType!. Compiler gives the error "Cannot convert value of type 'SomeType!.Type' (aka 'ImplicitlyUnwrappedOptional<SomeType>.Type') to ...