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Why is the default value of the string type null instead of an empty string?
... the behaviour of reference types. Before invoking their instance members, one should put a check in place for a null reference.
If the default value of string were the empty string, I would not have
to test, and I would feel it to be more consistent with the other
value types like int or do...
Ruby, remove last N characters from a string?
...uestion's had an answer for almost nine years that worked the same as this one, with 261 upvotes at the time of writing. JP accepted that and recently switched to this, so I'd say it answered their question :) I thought I'd pop this in as a modern alternative, and hope it helps people who land here....
When should I use cross apply over inner join?
...
Can anyone give me a good example of when CROSS APPLY makes a difference in those cases where INNER JOIN will work as well?
See the article in my blog for detailed performance comparison:
INNER JOIN vs. CROSS APPLY
CROSS APPLY...
#1071 - Specified key was too long; max key length is 767 bytes
...cter it would be three bytes resulting in max index prefix length of 254.
One option you have is to just place lower limit on your VARCHAR fields.
Another option (according to the response to this issue) is to get the subset of the column rather than the entire amount, i.e.:
ALTER TABLE `mytable`...
How do I bind to list of checkbox values with AngularJS?
...an array of objects. Each solution has it pros and cons. Below you'll find one for each case.
With a simple array as input data
The HTML could look like:
<label ng-repeat="fruitName in fruits">
<input
type="checkbox"
name="selectedFruits[]"
value="{{fruitName}}"
ng-ch...
Why does a return in `finally` override `try`?
...urnState;
}
}
Generally speaking you never want to have more than one return statement in a function, things like this are why.
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When to use extern in C++
...es the header knows about it, but you only need to “define” it once in one of your source files.
To clarify, using extern int x; tells the compiler that an object of type int called x exists somewhere. It's not the compilers job to know where it exists, it just needs to know the type and name s...
Monad in plain English? (For the OOP programmer with no FP background)
...on the amplified type, that obeys the rules of functional composition mentioned before.
There is often a way to get the unamplified type back out of the amplified type. Strictly speaking this operation is not required to have a monad. (Though it is necessary if you want to have a comonad. We won't c...
Which .NET Dependency Injection frameworks are worth looking into? [closed]
...Injection (DI) library for .NET 4+ that supports Silverlight 4+, Windows Phone 8, Windows 8 including Universal apps and Mono.
Microsoft.Extensions.DependencyInjection - The default IoC container for ASP.NET Core applications.
Scrutor - Assembly scanning extensions for Microsoft.Extensions.Dependenc...
How to redirect cin and cout to files?
...d; //output to the standard input
}
You could save and redirect in just one line as:
auto cinbuf = std::cin.rdbuf(in.rdbuf()); //save and redirect
Here std::cin.rdbuf(in.rdbuf()) sets std::cin's buffer to in.rdbuf() and then returns the old buffer associated with std::cin. The very same can be...