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Is there a performance difference between a for loop and a for-each loop?
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From Item 46 in Effective Java by Joshua Bloch :
The for-each loop, introduced in
release 1.5, gets rid of the clutter
and the opportunity for error by
hiding the iterator or index variable
completely. The resulti...
How to call multiple JavaScript functions in onclick event?
...ence to unobtrusive JS, I've come across this before, and I should refrain from writing obtrusive JS just because I'm lazy! xD
– Qcom
Oct 12 '10 at 0:19
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Understanding implicit in Scala
...t on a method can be marked implicit, which means the values will be taken from the context in which they are called. If there is no implicit value of the right type in scope, it will not compile. Since the implicit value must resolve to a single value and to avoid clashes, it's a good idea to make ...
$.focus() not working
...e. The reason that's not working is simply because it's not stealing focus from the dev console. If you run the following code in your console and then quickly click in your browser window after, you will see it focus the search box:
setTimeout(function() { $('input[name="q"]').focus() }, 3000);
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Laravel: Get base url
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And despite its possible appearance from the example, this is relative to the Laravel's root path, so if you're installed in /something/ it'll make the right URL.
– ceejayoz
Apr 14 '14 at 12:42
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How do you determine the size of a file in C?
... You could probably change the return type to ssize_t and cast the size from an off_t without any trouble. It would seem to make more sense to use a ssize_t :-) (Not to be confused with size_t which is unsigned and cannot be used to indicate error.)
– Ted Percival
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Convert hex string to int in Python
...g to an int, pass the string to int along with the base you are converting from.
Both strings will suffice for conversion in this way:
>>> string_1 = "0xffff"
>>> string_2 = "ffff"
>>> int(string_1, 16)
65535
>>> int(string_2, 16)
65535
Letting int infer
If you p...
Best way to find the intersection of multiple sets?
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From Python version 2.6 on you can use multiple arguments to set.intersection(), like
u = set.intersection(s1, s2, s3)
If the sets are in a list, this translates to:
u = set.intersection(*setlist)
where *a_list is list ...
DatabaseError: current transaction is aborted, commands ignored until end of transaction block?
... the transaction. (You might think of it as a safety feature, to keep you from corrupting your data.)
To fix this, you'll want to figure out where in the code that bad query is being executed. It might be helpful to use the log_statement and log_min_error_statement options in your postgresql serv...
What is the best way to repeatedly execute a function every x seconds?
... @JavaSa: because "do your stuff" is not instantaneous and errors from time.sleep may accumulate here. "execute every X seconds" and "execute with a delay of ~X seconds repeatedly" are not the same. See also this comment
– jfs
Jan 25 '17 at 15:42
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