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What is the purpose of a question mark after a type (for example: int? myVariable)?
...{
System.Console.WriteLine("num = Null");
}
// y is set to zero
int y = num.GetValueOrDefault();
// num.Value throws an InvalidOperationException if num.HasValue is false
try
{
y = num.Value;
}
catch (System.InvalidOperationExcept...
Have the same README both in Markdown and reStructuredText
... RST. This can be simply automated using pypandoc module and some magic in setup.py:
from setuptools import setup
try:
from pypandoc import convert
read_md = lambda f: convert(f, 'rst')
except ImportError:
print("warning: pypandoc module not found, could not convert Markdown to RST")
...
Clear variable in python
...
@Bnicholas However it's not like null in PHP, in that setting a variable to null in PHP gives you similar behaviour in most cases as if you hadn't defined it in the first place. A value of None in Python is quite different from an undefined variable. None is quite like most othe...
Does “untyped” also mean “dynamically typed” in the academic CS world?
...n the context of lambda calculus (in fact, even earlier, in the context of set theory). Since then, a whole branch of computational logic has emerged that is known as "type theory". Programming language theory is based on these foundations. And in all these mathematical contexts, "type" has a partic...
How can I get query string values in JavaScript?
...
For those of us using a fairly strict setup of JSHint swap the while(match = search.exec(query)) with while((match = search.exec(query)) !== null)
– craigts
Sep 4 '13 at 19:26
...
ImportError: No module named Crypto.Cipher
...a while since I did that project but I think I used the Python virtual env setting. In Python you can either use a standalone version or the virtual environment. You can check out this link if you need more information pythonforbeginners.com/basics/how-to-use-python-virtualenv
–...
How to Test Facebook Connect Locally
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Edit your app at www.facebook.com/developers/ and set the "Site URL" to "http://localhost/myapppath".
When done - change it back.
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Why start an ArrayList with an initial capacity?
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Setting the initial size of an ArrayList, e.g. to ArrayList<>(100), reduces the number of times the re-allocation of internal memory has to occur.
Example:
ArrayList example = new ArrayList<Integer>(3);
example...
Code Golf: Collatz Conjecture
...r values only' unless $n == int $n;
#
state @next;
$next[1] //= 0; # sets $next[1] to 0 if it is undefined
#
# fill out @next until we get to a value we've already worked on
until( defined $next[$n] ){
say $n;
#
if( $n % 2 ){ # odd
$next[$n] = 3 * $n + 1;
} else { #...
Best way to implement Enums with Core Data
...PaymentFrequencyWeekly = 3
} PaymentFrequency;
Then, declare getters and setters for your property. It's a bad idea to override the existing ones, since the standard accessors expect an NSNumber object rather than a scalar type, and you'll run into trouble if anything in the bindings or KVO system...