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How to find topmost view controller on iOS
... m4rkk: "Top-most" depends on which direction you're looking from. Do new controllers get added to the top (stack-like) or the bottom (tree-like)? In any case, the OP mentioned the navigation controller as being on top, which implies the grows-downward view.
– Wil...
Programmatically change the src of an img tag
...t require a jQuery answer. This solution is a kludge that prevents people from learning about what vanilla JS can already do.
– metaColin
Jan 30 '17 at 17:37
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Test if a command outputs an empty string
... 0m0.004s
user 0m0.000s
sys 0m0.007s
Full example
Updated example from the answer by Will Vousden:
if [[ $(ls -A | wc -c) -ne 0 ]]; then
echo "there are files"
else
echo "no files found"
fi
Updated again after suggestions by netj:
if [[ $(ls -A | head -c1 | wc -c) -ne 0 ]]; then...
Checking whether a variable is an integer or not [duplicate]
...r object should have (adding? multiplying? doubling?) by making it inherit from a specially-constructed class. That would be the best solution, since it will permit exactly those objects with the necessary and sufficient attributes, but you will have to read the docs on how to use it.
...
How does OpenID authentication work?
...and very informative about what happens behind the scenes.
(Answer pasted from my answer at OpenID login workflow?.)
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Rails migrations: self.up and self.down versus change
...erfluous (you can see in the documentation the methods currently supported from the change method).
But pay attention because for some kind of operation you still need to define the down method, for example if you change the precision of a decimal column how to guess the original precision on rollb...
What are major differences between C# and Java?
...allows a class to specifically implement methods of an interface, separate from its own class methods. This allows it also to implement two different interfaces which happen to have a method of the same name. The methods of an interface do not need to be public; they can be made to be accessible onl...
Detect if a NumPy array contains at least one non-numeric value?
...swer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Why should the copy constructor accept its parameter by reference in C++?
...e copy constructor of the given object; hence, to get the supplied object from caller into our function itself (in this case the copy constructor) we need to call the copy constructor, which is nothing but calling the same function during function declaration.
That's the reason for passing a refer...
How to remove the querystring and get only the url?
...com/myurl.html
[query] => unwan=abc&ab=1
)
This is the output from passing example urls through parse_url() with no second parameter (for explanation only).
And this is the final output after constructing url using:
foreach($test as $url){
echo reconstruct_url($url) . '<br/>...