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Scala list concatenation, ::: vs ++
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++ is also easy to mix up with +:
scala> List(1, 2, 3) + "ab"
res1: String = List(1, 2, 3)ab
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Laravel Eloquent: How to get only certain columns from joined tables
I have got 2 joined tables in Eloquent namely themes and users.
15 Answers
15
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Undefined, unspecified and implementation-defined behavior
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p[5] = 'w';
std::cout << p;
}
The variable p points to the string literal "hello!\n", and the two assignments below try to modify that string literal. What does this program do? According to section 2.14.5 paragraph 11 of the C++ standard, it invokes undefined behavior:
The effect o...
Copy file remotely with PowerShell
...CategoryInfo : PermissionDenied: (\\192.168.1.100\Shared\test.txt:String) [Copy-Item], UnauthorizedAccessException>
+ FullyQualifiedErrorId : ItemExistsUnauthorizedAccessError,Microsoft.PowerShell.Commands.CopyItemCommand
So this did it for me:
netsh advfirewall firewall set rule...
What's the difference between == and .equals in Scala?
...in Java" - depends on what exactly this is:
public static void main(final String... args) {
final double unboxedNaN = Double.NaN;
final Double boxedNaN = Double.valueOf(Double.NaN);
System.out.println(unboxedNaN == unboxedNaN);
System.out.println(boxedNaN == boxedNaN);
System.o...
Where can I find my Facebook application id and secret key?
...rom 2018:
Go to Settings -> Basic -> App Secret (type your password and you're ready to go).
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Django database query: How to get object by id?
...ror exception. What was confusing me was that the code below executed fine and returned a result set as expected:
Class.objects.all()
Tail of the traceback for the get() method:
File "django/db/models/loading.py", line 197, in get_models
self._populate()
File "django/db/models/loading.py", l...
JavaScript null check
... in JavaScript. However, it's always safe to test if the typeof(x) is the string "undefined", even if "x" is not a declared variable:
alert(typeof(x) === 'undefined'); // true
Also, variables can have the "undefined value" if they are not initialized:
var y;
alert(typeof(y) === 'undefined'); //...
Intercept page exit event
...some time to finish saving data');
};
break;
};
}; // no return string --> user will leave as normal but data is send to server
Edit:
See also Synchronous_AJAX and how to do that with jquery
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Run a Docker image as a container
... answered Aug 28 '13 at 21:14
AndyAndy
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