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What's the safest way to iterate through the keys of a Perl hash?
If I have a Perl hash with a bunch of (key, value) pairs, what is the preferred method of iterating through all the keys? I have heard that using each may in some way have unintended side effects. So, is that true, and is one of the two following methods best, or is there a better way?
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How do I get a consistent byte representation of strings in C# without manually specifying an encodi
...ow do I convert a string to a byte[] in .NET (C#) without manually specifying a specific encoding?
40 Answers
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Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
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Because interfaces specify only what the class is doing, not how it is doing it.
The problem with multiple inheritance is that two classes may define different ways of doing the same thing, and the subclass can't choose which one to pick.
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String.equals versus == [duplicate]
...ue can actually be compared with ==, but it's better not to rely on that.
if (usuario.equals(datos[0])) {
...
}
NB: the compare is done on 'usuario' because that's guaranteed non-null in your code, although you should still check that you've actually got some tokens in the datos array otherwi...
When is a function too long? [closed]
... fast rules for it. Generally I like my methods to just "do one thing". So if it's grabbing data, then doing something with that data, then writing it to disk then I'd split out the grabbing and writing into separate methods so my "main" method just contains the "doing something".
That "doing somet...
CSRF Token necessary when using Stateless(= Sessionless) Authentication?
...ests"
http://angular-tips.com/blog/2014/05/json-web-tokens-introduction/
"If we go down the cookies way, you really need to do CSRF to avoid cross site requests. That is something we can forget when using JWT as you will see."
(JWT = Json Web Token, a Token based authentication for stateless apps)
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PHP multidimensional array search by value
...searchForId($id, $array) {
foreach ($array as $key => $val) {
if ($val['uid'] === $id) {
return $key;
}
}
return null;
}
This will work. You should call it like this:
$id = searchForId('100', $userdb);
It is important to know that if you are using === operat...
How does java do modulus calculations with negative numbers?
...umbers are in use - some languages use one definition and some the other.
If you want to get a negative number for negative inputs then you can use this:
int r = x % n;
if (r > 0 && x < 0)
{
r -= n;
}
Likewise if you were using a language that returns a negative number on a neg...
Is delete this allowed?
Is it allowed to delete this; if the delete-statement is the last statement that will be executed on that instance of the class? Of course I'm sure that the object represented by the this -pointer is new ly-created.
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How do I find the most recent git commit that modified a file?
I want to find the most recent commit that modified a source file.
6 Answers
6
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