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LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria
...e FirstOrDefault. The exception is what makes it SingleOrDefault. Good point bringing it up, and puts a nail on the coffin of differences.
– Fabio S.
Dec 10 '14 at 18:33
17
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nonlocal keyword in Python 2.x
...
d['y'] += 1
return d['y']
return inner
f = outer()
print(f(), f(), f()) #prints 1 2 3
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What is the difference between HashSet and List?
...bers.
Because a HashSet is constrained to contain only unique entries, the internal structure is optimised for searching (compared with a list) - it is considerably faster
Adding to a HashSet returns a boolean - false if addition fails due to already existing in Set
Can perform mathematical set oper...
How and/or why is merging in Git better than in SVN?
...e clever thing" Git is "better at". And you're thing is checked into SVN.
Convert your SVN into the equivalent Git form, do it in Git, and then check the result in, perhaps using multiple commits, some extra branches. If you can imagine an automated way to turn an SVN problem into a Git problem, th...
Remove elements from collection while iterating
... there.
Considerations:
What method you use might depend on what you are intending to do
The collect and removeAl technique works with any Collection (Collection, List, Set, etc).
The ListIterator technique obviously only works with lists, provided that their given ListIterator implementation o...
Keeping ASP.NET Session Open / Alive
...at").show().fadeOut(1000); // just a little "red flash" in the corner :)
into
beatHeart(2); // just a little "red flash" in the corner :)
and add
// beat the heart
// 'times' (int): nr of times to beat
function beatHeart(times) {
var interval = setInterval(function () {
$(".heartb...
How can I check if a method is static using reflection?
...d.getModifiers()).
/**
* Returns the public static methods of a class or interface,
* including those declared in super classes and interfaces.
*/
public static List<Method> getStaticMethods(Class<?> clazz) {
List<Method> methods = new ArrayList<Method>();
for (...
How to add a browser tab icon (favicon) for a website?
...
Use a tool to convert your png to a ico file. You can search "favicon generator" and you can find many online tools.
Place the ico address in the head with a link-tag:
<link rel="shortcut icon" href="http://sstatic.net/stackoverflow/im...
Boolean.hashCode()
...composite numbers (non-primes), say 1000 and 2000. When inserting booleans into a hash table, true and false would go into bucket 1000 % N resp 2000 % N (where N is the number of buckets).
Now notice that
1000 % 8 same bucket as 2000 % 8
1000 % 10 same bucket as 2000 % 10
1000 % 20 same bucket ...
Calculate text width with JavaScript
...me browsers, this method yields sub-pixel accuracy (result is a floating point number), on others it does not (result is only an int). You might want to run Math.floor (or Math.ceil) on the result, to avoid inconsistencies. Since the DOM-based method is never sub-pixel accurate, this method has even...