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Why are interface variables static and final by default?
...racle.com/javase/tutorial/java/IandI/… . A class cannot extend more than one class due to the same reason.
– denis
Aug 17 '17 at 21:02
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How do I clone a Django model instance object and save it to the database?
... run save().
obj = Foo.objects.get(pk=<some_existing_pk>)
obj.pk = None
obj.save()
If you want auto-generated key, set the new key to None.
More on UPDATE/INSERT here.
Official docs on copying model instances: https://docs.djangoproject.com/en/2.2/topics/db/queries/#copying-model-instance...
How to use ELMAH to manually log errors
...ption. Log method does not.
Raise is subscription based and is able to log one exception into the several loggers.
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The most accurate way to check JS object's type?
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The JavaScript specification gives exactly one proper way to determine the class of an object:
Object.prototype.toString.call(t);
http://bonsaiden.github.com/JavaScript-Garden/#types
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image.onload event and browser cache
...oad? You had it right in the first code example, but messed up the second one. The second one will not work properly in some versions of IE.
– jfriend00
Sep 10 '12 at 16:42
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How do you remove duplicates from a list whilst preserving order?
...me alternatives: http://www.peterbe.com/plog/uniqifiers-benchmark
Fastest one:
def f7(seq):
seen = set()
seen_add = seen.add
return [x for x in seq if not (x in seen or seen_add(x))]
Why assign seen.add to seen_add instead of just calling seen.add? Python is a dynamic language, and r...
Which iOS app version/build number(s) MUST be incremented upon App Store release?
...e many builds for any particular release of your App, you only need to use one new Version Number for each new release of your App.
You cannot re-use Version Numbers.
For every new build you submit, you will need to invent a new Build Number whose value is greater than the last Build Number you ...
Approximate cost to access various caches and main memory?
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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Opacity of div's background without affecting contained element in IE 8?
...c);
}
Hope that helps.
[EDIT]
For what it's worth, as others have mentioned, you can use IE's filter style, with the gradient keyword. The CSS3Pie solution does actually use this same technique behind the scenes, but removes the need for you to mess around directly with IE's filters, so your sty...
What is the difference between background and background-color
...es the background-color, using the background shorthand you could also add one or more values without repeating any other background-* property more than once.
Which one to choose is essentially up to you, but it could also depend on specific conditions of your style declarations (e.g if you need t...