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How does the new automatic reference counting mechanism work?
... counting was invented in 1960 and has been used in many languages such as Python and Mathematica. It is not used in the JVM or CLR because it is very slow and leaks cycles.
– J D
Jan 25 '14 at 15:08
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Why are joins bad when considering scalability?
...e structured data (you could do that with flat file constructs like csv or xml). A few of the options I listed will even let you completely build your join in advance, so the results are already done before you issue the query — just as if you had denormalized the data (admittedly at the cost of s...
Why should I use the keyword “final” on a method parameter in Java?
...eally does?
EDIT: I should really have summed all of this up with a Monty Python reference; the question seems somewhat similar to asking "What have the Romans ever done for us?"
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How can I convert spaces to tabs in Vim or Linux?
...bulate the whole file
Before doing anything like this (particularly with Python files!), I usually set 'list', so that I can see the whitespace and change.
I have the following mapping in my .vimrc for this:
nnoremap <F2> :<C-U>setlocal lcs=tab:>-,trail:-,eol:$ list! list? <...
What is meant by 'first class object'?
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Simple test. If you can do this in your language (Python as example):
def double(x):
return x*x
f = double
print f(5) #prints 25
Your language is treating functions as first class objects.
s...
Use C++ with Cocoa Instead of Objective-C?
...described above. Currently dynamically typed, runtime-bound languages like Python, Ruby, etc. are the only real option for writing a Cocoa app without Objective-C (though of course these bridges use Objective-C under the hood).
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How to change the background color of the options menu?
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@Janusz In Styles.xml. This will probably help: developer.android.com/guide/topics/resources/…
– Pilot_51
Jun 30 '11 at 21:30
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How do you make a web application in Clojure? [closed]
...orld. I never made a web app from scratch in Java. If I have to do it with Python, Ruby, I know where to go (Django or Rails), but if I want to make a web application in Clojure, not because I'm forced to live in a Java world, but because I like the language and I want to give it a try, what librari...
Singleton: How should it be used
... variable until the first time that variable is needed.
Languages such as Python and Ruby use singletons very little because you can use global variables within a module instead.
So when is it good/bad to use a singleton? Pretty much exactly when it would be good/bad to use a global variable.
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How to remove frame from matplotlib (pyplot.figure vs matplotlib.figure ) (frameon=False Problematic
...s a TypeError: write() argument must be str, not bytes exception for me on python 3. Opening the file as write binary ('wb') is needed for it to work.
– Gabriel Jablonski
Nov 3 '19 at 22:18
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