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Why should I use a pointer rather than the object itself?
...t a copy of it. If you're okay with copying/moving the object (most of the time you should be), you should prefer an automatic object.
You need to allocate a lot of memory, which may easily fill up the stack. It would be nice if we didn't have to concern ourselves with this (most of the time you sho...
How do I get a Date without time in Java?
...from Stack Overflow question Java program to get the current date without timestamp :
22 Answers
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Find Java classes implementing an interface [duplicate]
Some time ago, I came across a piece of code, that used some piece of standard Java functionality to locate the classes that implemented a given interface. I know the functions were hidden in some non-logical place, but they could be used for other classes as the package name implied. Back then I di...
How can I use xargs to copy files that have spaces and quotes in their names?
... People use xargs because typically it's faster to call an executable 5 times with 200 arguments each time than to call it 1000 times with one argument every time.
– tzot
Oct 14 '08 at 1:23
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Regular Expressions- Match Anything
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I don't know but every time I use this expression, I feel guilty, for not making a specific expression for my use case. If say, w+ isn't enough, I end up using .+. Luckily hasn't come back to bite me yet.
– Tushar
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Modifying a subset of rows in a pandas dataframe
... internals to know exactly why that works, but the basic issue is that sometimes indexing into a DataFrame returns a copy of the result, and sometimes it returns a view on the original object. According to documentation here, this behavior depends on the underlying numpy behavior. I've found that ac...
Postgres: clear entire database before re-creating / re-populating from bash script
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one trick that saves me time is $ sudo -u postgres dropdb DATABASE_NAME
– Alvin
Jan 6 '14 at 23:31
37
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while (1) Vs. for (;;) Is there a speed difference?
... but chances are the code inside of the loop is going to be a few thousand times more expensive than the loop itself anyway, so who cares?
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.trim() in JavaScript not working in IE
...r. Note that replace(/^\s\s*/, '').replace(/\s\s*$/, '') should be about 3 times faster than replace(/^\s+|\s+$/, '') in Firefox 2, according to one benchmark: blog.stevenlevithan.com/archives/faster-trim-javascript
– Daniel Vassallo
Feb 22 '10 at 0:53
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When to use generic methods and when to use wild-card?
... c.add(o); // correct
}
}
But the following will result in compile time error.
static <T> void fromArrayToCollection(T[] a, Collection<?> c) {
for (T o : a) {
c.add(o); // compile time error
}
}