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PHP: How to use array_filter() to filter array keys?
...r Maček's problem, it doesn't actually use array_filter. If you came here from a search engine you maybe where looking for something like this (PHP >= 5.3):
$array = ['apple' => 'red', 'pear' => 'green'];
reset($array); // Unimportant here, but make sure your array is reset
$apples = arr...
How to properly check if std::function is empty in C++11?
...eaning to the phrase "implicit conversion", and it is distinctly different from "contextual conversion to bool," which also has a very specific meaning. There is no "Is-a" relationship here. I understand that beginners probably don't need to know the difference between implicit/explicit/contextual...
When should I use a List vs a LinkedList
...ll out into your code.
However, if you need to do many insertions/removals from within a list, it offers constant time. List<T> offers linear time, as extra items in the list must be shuffled around after the insertion/removal.
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How to create a tuple with only one element
...:
>>> a = [('a',), ('b',), ('c', 'd')]
^ ^
From the Python Docs:
A special problem is the construction of tuples containing 0 or 1 items: the syntax has some extra quirks to accommodate these. Empty tuples are constructed by an empty pair of parentheses; a tuple w...
How to quit scala 2.11.0 REPL?
In the last version of scala (2.10.3) REPL, I can type exit to quit from REPL. However, in Scala 2.11.0 this doesn't work.
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Init method in Spring Controller (annotation version)
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If you need to use the User from SecurityContextHolder, at PostConstruct moment it's not initialized. It's need to be used like a stateless method. (getUser()... { return Security...user(); }
– Joao Polo
Nov 24 '15...
Blocks on Swift (animateWithDuration:animations:completion:)
...it is hiding slowly and when it is completely transparent; removes it self from parent view
ok variable will always returns true with animation termination.
alpha = 1
UIView.animate(withDuration: 0.5, animations: {
self.alpha = 0
}) { (ok) in
print("Ended \(ok)")
...
What is %2C in a URL?
...
Another technique that you can use to get the symbol from url gibberish is to open Chrome console with F12 and just paste following javascript:
decodeURIComponent("%2c")
it will decode and return the symbol (or symbols).
Hope this saves you some time.
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Postgresql: Conditionally unique constraint
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This note was removed from the docs in august 2015
– Raniz
Dec 18 '19 at 13:34
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What is the difference between a strongly typed language and a statically typed language?
...ically typed
Strongly typed means, a will not be automatically converted from one type to another. Weakly typed is the opposite: Perl can use a string like "123" in a numeric context, by automatically converting it into the int 123. A strongly typed language like python will not do this.
Statical...