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In what situations would AJAX long/short polling be preferred over HTML5 WebSockets?
...n to the server, sends request headers with optional data, gets a response from the server, and closes the connection.
Supported in all major browsers.
Long poll - request → wait → response. Creates a connection to the server like AJAX does, but maintains a keep-alive connection open for some t...
throwing exceptions out of a destructor
... fails... There is really no good way to protect against exceptions thrown from destructors, so the library makes no guarantees if an element destructor throws" (from Appendix E3.2) .
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What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?
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The difference from the Java API Specifications is as follows.
For ClassNotFoundException:
Thrown when an application tries to
load in a class through its string
name using:
The forName method in class Class.
The findSyst...
How can I run a program from a batch file without leaving the console open after the program starts?
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You can use the exit keyword. Here is an example from one of my batch files:
start myProgram.exe param1
exit
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Reimport a module in python while interactive
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This should work:
reload(my.module)
From the Python docs
Reload a previously imported module. The argument must be a module object, so it must have been successfully imported before. This is useful if you have edited the module source file using an external...
An error occurred while validating. HRESULT = '8000000A'
... deployment, but not for automatic) and removing the source control coding from the projects, which hasn't helped me.
18 A...
Generate all permutations of a list without adjacent equal elements
...tic; it could be reduced to linear (optimal) with better data structures.
from collections import Counter
from itertools import permutations
from operator import itemgetter
from random import randrange
def get_mode(count):
return max(count.items(), key=itemgetter(1))[0]
def enum2(prefix, x,...
NSDate get year/month/day
...r] components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear fromDate:[NSDate date]];
That generates an NSDateComponents object containing the day, month, and year from the current system calendar for the current day. (Note: this isn't necessarily the current user-specified calendar,...
jQuery AJAX cross domain
...e quotes. jQuery will pass it's own callback name, so you need to get that from the GET params.
And as Stefan Kendall posted, $.getJSON() is a shorthand method, but then you need to append 'callback=?' to the url as GET parameter (yes, value is ?, jQuery replaces this with its own generated callbac...
Checking from shell script if a directory contains files
From a shell script, how do I check if a directory contains files?
26 Answers
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