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Long vs Integer, long vs int, what to use and when?
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In a theoretical world where Java behaved completely differently from how it actually does, and passing an object or array to a function resulted in a totally separate copy (where modifications inside the function weren't reflected to callers at all), how would you t...
Convert bytes to a string
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>>> b"abcde"
b'abcde'
# utf-8 is used here because it is a very common encoding, but you
# need to use the encoding your data is actually in.
>>> b"abcde".decode("utf-8")
'abcde'
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In-memory size of a Python structure
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The recommendation from an earlier question on this was to use sys.getsizeof(), quoting:
>>> import sys
>>> x = 2
>>> sys.getsizeof(x)
14
>>> sys.getsizeof(sys.getsizeof)
32
>>> sys.get...
How to change the cursor into a hand when a user hovers over a list item?
...irksmode.org/css/user-interface/cursor.html#note (referenced in an earlier comment) states that hand must come after pointer. I recommend using just pointer - IE 5.5 is deader than IE 6.
– Iiridayn
Jul 10 '13 at 21:31
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Regular expression to allow spaces between words
... that one would not usually mean to match:
An empty string, "".
A string comprised entirely of spaces, " ".
A string that leads and / or trails with spaces, " Hello World ".
A string that contains multiple spaces in between words, "Hello World".
Originally I didn't think ...
Failed to serialize the response in Web API with Json
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When it comes to returning data back to the consumer from Web Api (or any other web service for that matter), I highly recommend not passing back entities that come from a database. It is much more reliable and maintainable to use M...
What are invalid characters in XML
...ou do manage to properly escape it into an XML document, most viewers will complain about the invalid character. Edge case but it does happen.
– Rick Strahl
Jan 2 '12 at 9:56
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Obtaining a powerset of a set in Java
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Yes, it is O(2^n) indeed, since you need to generate, well, 2^n possible combinations. Here's a working implementation, using generics and sets:
public static <T> Set<Set<T>> powerSet(Set<T> originalSet) {
Set<Set<T>> sets = new HashSet<Set<T>>(...
Indent multiple lines quickly in vi
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Use the > command. To indent five lines, 5>>. To mark a block of lines and indent it, Vjj> to indent three lines (Vim only). To indent a curly-braces block, put your cursor on one of the curly braces and use >% or from anyw...
White space showing up on right side of page when background image should extend full length of page
... iphone with this code, it became very slow. I found in the end it was the combination of height: 100% and overflow-x: hidden, so I removed height: 100% and it works much better.
– Paul Mason
Jul 11 '12 at 18:28
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