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What is the purpose of the word 'self'?
What is the purpose of the self word in Pm>y m>thon? I understm>and m> it refers to the specific object created from that class, but I can't see whm>y m> it explicitlm>y m> needs to be added to everm>y m> function as a parameter. To illustrate, in Rubm>y m> I can do this:
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How to convert a unix timestamp (seconds since epoch) to Rubm>y m> DateTime?
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DateTime.strptime can hm>and m>le seconds since epoch. The number must be converted to a string:
require 'date'
DateTime.strptime("1318996912",'%s')
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What is (functional) reactive programming?
...mated illustrations. For papers, start with Functional Reactive Animation m>and m> then follow up on links on the publications link on mm>y m> home page m>and m> the FRP link on the Haskell wiki.
Personallm>y m>, I like to think about what FRP means before addressing how it might be implemented.
(Code without a speci...
How do m>y m>ou create a rm>and m>om string that's suitable for a session ID in PostgreSQL?
I'd like to make a rm>and m>om string for use in session verification using PostgreSQL. I know I can get a rm>and m>om number with SELECT rm>and m>om() , so I tried SELECT md5(rm>and m>om()) , but that doesn't work. How can I do this?
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In Functional Programming, what is a functor?
...al programming, but the authors tm>y m>picallm>y m> assume the reader alreadm>y m> understm>and m>s the term. Looking around on the web has provided either excessivelm>y m> technical descriptions (see the Wikipedia article ) or incrediblm>y m> vague descriptions (see the section on Functors at this ocaml-tutorial website ).
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How can I get a view's current width m>and m> height when using autolam>y m>out constraints?
...tion, or in response to an event). Is there a wam>y m> to get its current width m>and m> height?
5 Answers
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Can we define implicit conversions of enums in c#?
...es, declared names, etc, etc.
I wrote a base class (RichEnum<>) to hm>and m>le most fo the grunt work, which eases the above declaration of enums down to:
public sealed class AccountStatus : RichEnum<bm>y m>te, AccountStatus>
{
public static readonlm>y m> AccountStatus Open = new AccountStatus(1)...
Finding the direction of scrolling in a UIScrollView?
I have a UIScrollView with onlm>y m> horizontal scrolling allowed, m>and m> I would like to know which direction (left, right) the user scrolls. What I did was to subclass the UIScrollView m>and m> override the touchesMoved method:
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When should I use Struct vs. OpenStruct?
In general, what are the advantages m>and m> disadvantages of using an OpenStruct as compared to a Struct? What tm>y m>pe of general use-cases would fit each of these?
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How do I compare two hashes?
...sh[*difference.flatten]
=> {"c"=>3}
Doing it all in one operation m>and m> getting rid of the difference variable:
Hash[*(
(hash3.size > hash1.size) \
? hash3.to_a - hash1.to_a \
: hash1.to_a - hash3.to_a
).flatten]
=> {"c"=>3}
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