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Understand the “Decorator Pattern” with a real world example
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Do not like this pattern one bit. Maybe it's the example though. The main issue I have with it in terms of OOD is that a topping is not a pizza. Asking the topping for the price of the pizza it's applied to just doesn't sit right with me. It's a very...
what is “strict mode” and how is it used?
... I read it over and I'm having trouble understanding what it does. Can someone briefly explain (in general) what its purpose is and how it is useful?
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In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
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One contending technology you've omitted is Server-Sent Events / Event Source. What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet? has a good discussion of all of these. Keep in mind that some of these ar...
How to convert an xml string to a dictionary?
...would like to convert directly to a Python dictionary, the same way it is done in Django's simplejson library.
16 Answers...
How to use single storyboard uiviewcontroller for multiple subclass
...nd doesn't reallocate memory to accommodate for e.g. different properties. One indicator for this is that the pointer to self doesn't change. So inspection of the object (e.g. reading _ivar / property values) after object_setClass can cause crashes.
– Patrik
Au...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...cessor manual for more information.
A largely irrelevant aside: the "Best One Liner" winner of the 1987 International Obfuscated C Code Contest, by David Korn (yes, the author of the Korn Shell) took advantage of the predefined unix macro:
main() { printf(&unix["\021%six\012\0"],(unix)["have"]...
How to compute the similarity between two text documents?
...ltk.stem.porter.PorterStemmer()
remove_punctuation_map = dict((ord(char), None) for char in string.punctuation)
def stem_tokens(tokens):
return [stemmer.stem(item) for item in tokens]
'''remove punctuation, lowercase, stem'''
def normalize(text):
return stem_tokens(nltk.word_tokenize(text....
When to wrap quotes around a shell variable?
Could someone tell me whether or not I should wrap quotes around variables in a shell script?
5 Answers
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Rails: FATAL - Peer authentication failed for user (PG::Error)
...cally, I gave my whole app read write privileges like this:
9b) Climb up one directory level:
$ cd ..
9c) Set the permissions of the my_application directory and all its contents to 666:
$ chmod -R 0666 my_application
9d) And run the migration again:
$ RAILS_ENV=development rake db:migrate
...
Simultaneously merge multiple data.frames in a list
...ft joins using dplyr in R . The question was marked as a duplicate of this one so I answer here, using the 3 sample data frames below:
x <- data.frame(i = c("a","b","c"), j = 1:3, stringsAsFactors=FALSE)
y <- data.frame(i = c("b","c","d"), k = 4:6, stringsAsFactors=FALSE)
z <- data.frame(i...