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Check if $_POST exists
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The proper way of checking if array key exists is function array_key_exists()
The difference is that when you have $_POST['variable'] = null it means that key exists and was send but value was null
The other option is isset() which which will check if ...
How to debug a bash script? [closed]
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https://github.com/koalaman/shellcheck
A little example:
$ cat test.sh
ARRAY=("hello there" world)
for x in $ARRAY; do
echo $x
done
$ shellcheck test.sh
In test.sh line 3:
for x in $ARRAY; do
^-- SC2128: Expanding an array without an index only gives the first element.
fix the b...
How do I sort an NSMutableArray with custom objects in it?
...retty simple, but I can't find any answers on the web. I have an NSMutableArray of objects, and let's say they are 'Person' objects. I want to sort the NSMutableArray by Person.birthDate which is an NSDate .
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How to normalize a NumPy array to within a certain range?
After doing some processing on an audio or image array, it needs to be normalized within a range before it can be written back to a file. This can be done like so:
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What is :: (double colon) in Python when subscripting sequences?
...o really see what is happening, you need to coerce the range to a list, np.array, etc.
– PikalaxALT
Sep 19 '14 at 0:54
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Are loops really faster in reverse?
... takes time in ascending loops is evaluating, for each i, the size of your array. In this loop:
for(var i = array.length; i--;)
You evaluate .length only once, when you declare i, whereas for this loop
for(var i = 1; i <= array.length; i++)
you evaluate .length each time you increment i, wh...
Resolve promises one after another (i.e. in sequence)?
Consider the following code that reads an array of files in a serial/sequential manner. readFiles returns a promise, which is resolved only once all files have been read in sequence.
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PHP Difference between array() and []
... I wanted a reference and found this- php.net/manual/en/language.types.array.php - "As of PHP 5.4 you can also use the short array syntax, which replaces array() with []."
– mrwaim
Feb 12 '15 at 12:30
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When to use LinkedList over ArrayList in Java?
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Summary ArrayList with ArrayDeque are preferable in many more use-cases than LinkedList. If you're not sure — just start with ArrayList.
LinkedList and ArrayList are two different implementations of the List interface. LinkedLi...
How to find and return a duplicate value in array
arr is array of strings:
20 Answers
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