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Get first key in a (possibly) associative array?
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2019 Update
Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more info.
You can use reset and key:
reset($array);
$first_key = key(...
How do I get the file extension of a file in Java?
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Do you really need a "parser" for this?
String extension = "";
int i = fileName.lastIndexOf('.');
if (i > 0) {
extension = fileName.substring(i+1);
}
Assuming that you're dealing with simple Windows-like file names, not som...
How to pass objects to functions in C++?
...ne whether to pass by const reference or not.)
Passing by pointer is virtually never advised. Optional parameters are best expressed as a std::optional (boost::optional for older std libs), and aliasing is done fine by reference.
C++11's move semantics make passing and returning by value much more ...
What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
...ll be faster.
ContainsKey uses the same check as TryGetValue, which internally refers to the actual entry location. The Item property actually has nearly identical code functionality as TryGetValue, except that it will throw an exception instead of returning false.
Using ContainsKey followed by t...
Can Git hook scripts be managed along with the repository?
We'd like to make a few basic hook scripts that we can all share -- for things like pre-formatting commit messages. Git has hook scripts for that that are normally stored under <project>/.git/hooks/ . However, those scripts are not propagated when people do a clone and they are not version ...
How to distinguish mouse “click” and “drag”
...dited Jun 26 '19 at 12:45
Rivenfall
80466 silver badges1414 bronze badges
answered May 18 '11 at 9:03
wong2won...
What does glLoadIdentity() do in OpenGL?
I'm new to OpenGL and I'm a little overwhelmed with all of the random functions that I have in my code. They work and I know when to use them, but I don't know why I need them or what they actually do.
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Is it a good idea to index datetime field in mysql?
...atabase is very broad. I'd say to just make sure that it's normalized and all appropriate columns are indexed (i.e. ones used in joins and where clauses).
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angular.element vs document.getElementById or jQuery selector with spin (busy) control
... '#some-id' ) );
You wrap the Document.querySelector() native Javascript call into the angular.element() call. So you always get the element in a jqLite or jQuery object, depending whether or not jQuery is available/loaded.
Official documentation for angular.element:
If jQuery is available, angula...
how to remove untracked files in Git?
...y files, that you havn't thought of at first. Please double check and read all the comments below this answer and the --help section, etc., so to know all details to fine-tune your commands and surely get the expected result.
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