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Avoiding instanceof in Java
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You might be interested in this entry from Steve Yegge's Amazon blog: "when polymorphism fails". Essentially he's addressing cases like this, when polymorphism causes more trouble than it solves.
The issue is that to use polymorphism yo...
How do I set a column value to NULL in SQL Server Management Studio?
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If you are using the table interface you can type in NULL (all caps)
otherwise you can run an update statement where you could:
Update table set ColumnName = NULL where [Filter for record here]
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How to redirect from OnActionExecuting in Base Controller?
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try { int CompanyId = UserContext.Company.CompanyId; } catch { if (filterContext.Controller.GetType() != typeof(AccountController)) { filterCon...
How to make a variadic macro (variable number of arguments)
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C99 way, also supported by VC++ compiler.
#define FOO(fmt, ...) printf(fmt, ##__VA_ARGS__)
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Angular ng-repeat Error “Duplicates in a repeater are not allowed.”
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Yikes, what pointlessly nasty design on Angular's part. It would be very, very easy to miss this issue during development and testing because your array never contained duplicates, only to have your app explode in production when it gets e...
How do I wait for an asynchronously dispatched block to finish?
... STAssert…
dispatch_semaphore_signal(sema);
}];
if (![NSThread isMainThread]) {
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
} else {
while (dispatch_semaphore_wait(sema, DISPATCH_TIME_NOW)) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDa...
Java: What is the difference between and ?
... {
static Log log = LogFactory.getLog(); // <clinit>
private int x = 1; // <init>
X(){
// <init>
}
static {
// <clinit>
}
}
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Lowercase JSON key names with JSON Marshal in Go
...the generated json is formatted.
For example:
type T struct {
FieldA int `json:"field_a"`
FieldB string `json:"field_b,omitempty"`
}
This will generate JSON as follows:
{
"field_a": 1234,
"field_b": "foobar"
}
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How to make a Java thread wait for another thread's output?
...ered Nov 14 '08 at 7:56
Herman LintveltHerman Lintvelt
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In Python, when to use a Dictionary, List or Set?
...oes not: also a crucial distinction. (A "multiset", which maps duplicates into a different count for items present more than once, can be found in collections.Counter -- you could build one as a dict, if for some weird reason you couldn't import collections, or, in pre-2.7 Python as a collections.d...