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Check if string contains only digits
...wwwald: Some languages implement it differently, but in JavaScript, \d is exactly equivalent to [0-9].
– Ry-♦
Jul 3 '17 at 7:53
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Why does document.querySelectorAll return a StaticNodeList rather than a real Array?
...at I can't just do document.querySelectorAll(...).map(...) even in Firefox 3.6, and I still can't find an answer, so I thought I'd cross-post on SO the question from this blog:
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Numpy how to iterate over columns of array?
Suppose I have and m x n array. I want to pass each column of this array to a function to perform some operation on the entire column. How do I iterate over the columns of the array?
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vertical & horizontal lines in matplotlib
...rtical lines at specified limits. I would like to bound the data by this box. However, the sides do not seem to comply with my instructions. Why is this?
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design a stack such that getMinimum( ) should be O(1)
... solution which doesn't do that though, without wrecking the runtime complexity somewhere (e.g. making push/pop O(n)). Note that this doesn't change the complexity of the space required, e.g. if you've got a stack with O(n) space requirements, this will still be O(n) just with a different constant f...
How to search a specific value in all tables (PostgreSQL)?
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If you want to grep text data (which is typically encoded in more recent versions of postgres), you may need to ALTER DATABASE your_db_name SET bytea_output = 'escape'; on the database (or a copy thereof) before dumping it. (I'm not seeing a way t...
Practical uses for AtomicInteger
...tion (compareAndSet()) to implement non-blocking algorithms.
Here is an example of non-blocking random number generator from Brian Göetz's Java Concurrency In Practice:
public class AtomicPseudoRandom extends PseudoRandom {
private AtomicInteger seed;
AtomicPseudoRandom(int seed) {
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How to ignore xargs commands if stdin input is empty?
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For GNU xargs, you can use the -r or --no-run-if-empty option:
--no-run-if-empty
-r If the standard input does not contain any nonblanks, do not run the command. Normally, the command is run once even if there is n...
The best way to remove duplicate values from NSMutableArray in Objective-C?
...nswer below in 2009; in 2011, Apple added NSOrderedSet to iOS 5 and Mac OS X 10.7. What had been an algorithm is now two lines of code:
NSOrderedSet *orderedSet = [NSOrderedSet orderedSetWithArray:yourArray];
NSArray *arrayWithoutDuplicates = [orderedSet array];
If you are worried about the ord...
How do I calculate percentiles with python/numpy?
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By now, a percentile function exists in numpy: docs.scipy.org/doc/numpy/reference/generated/…
– Anaphory
Oct 29 '13 at 14:36
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