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Is there a practical use for weak references? [duplicate]
Since weak references can be claimed by the garbage collector at any time, is there any practical reason for using them?
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string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
...u need.
I don't consider using any of them as a bad practice. Most of the time IsNullOrEmpty() is enough. But you have the choice :)
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Add unique constraint to combination of two columns
I have a table and, somehow, the same person got into my Person table twice. Right now, the primary key is just an autonumber but there are two other fields that exist that I want to force to be unique.
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Android : difference between invisible and gone?
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INVISIBLE:The view has to be drawn and it takes time.
GONE:The view doesn't have to be drawn.
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Regex to match a digit two or four times
... two digits, and optionally two more
(?:\d{2}){1,2} <-- two digits, times one or two
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What's quicker and better to determine if an array key exists in PHP?
...1759158/520857
Summary:
| Method Name | Run time | Difference
=========================================================================================
| NonExistant::noCheckingTest() | 0.86004090309143 | +18491.315775911%
| NonExistant::empt...
What exactly is LLVM?
I keep hearing about LLVM all the time. It's in Perl, then it's in Haskell, then someone uses it in some other language? What is it?
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CA2202, how to solve this case
...hat this is solving, correct? (It's okay to dispose these objects multiple times.) -- I would remove the down vote if I could (SO prevents me, it says you have to edit the answer) -- but I would only do so reluctantly... -- and seriously, don't ever do this.
– BrainSlugs83
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Repeating characters in VIM insert mode
...ightly different version of Eelvex's solution:
function! Repeat()
let times = input("Count: ")
let char = input("Char: ")
exe ":normal a" . repeat(char, times)
endfunction
imap <C-u> <C-o>:call Repeat()<cr>
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How do I get the difference between two Dates in JavaScript?
I'm creating an application which lets you define events with a time frame. I want to automatically fill in the end date when the user selects or changes the start date. I can't quite figure out, however, how to get the difference between the two times, and then how to create a new end Date using ...