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Fast way of finding lines in one file that are not in another?
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@mr.spuratic ah yeah, now I find it in the man diff. Thanks!
– Archeosudoerus
Nov 2 '18 at 19:17
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Single quotes vs. double quotes in Python [closed]
... My opinion has changed on this greatly since I wrote this. It's now just kind of one situation where I would argue that I would use double-quotes. Another would be yours in the context of using single quotes. See the accepted answer for my current stance on the matter in more detail. I th...
Guaranteed lifetime of temporary in C++?
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litb's answer is accurate. The lifetime of the temporary object (also known as an rvalue) is tied to the expression and the destructor for the temporary object is called at the end of the full expression and when the destructor on StringBuffer is called, the destructor on m_buffer will also be c...
Why do we have map, fmap and liftM?
..., and has spent a lot of time helping people who are learning the language now, it's not at all clear that it even helped in any way. Certainly not enough to offset the useless redundancy (which itself leads to people asking questions like this one); the Functor class is too common to ignore, and be...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
.../y - 1/x^2) but they will be equally complicated.
Let's look at 1/sqrt(y) now. You can try f(x) = x^2 - 1/y, but it will be equally complicated: dx = 2xy / (y*x^2 - 1) for instance.
One non-obvious alternate choice for f(x) is: f(x) = y - 1/x^2
Then: dx = -f/f' = (y - 1/x^2) / (2/x^3) = 1/2 * x * ...
How to reverse a string in Go?
... Wow, wtf is up with the double assignment when reversing? Interesting. Now, think about a string with an uneven number of runes. The middle one gets special treatment, with the correct end-result after all though. :) An interesting little optimization I wouldn’t have thought of right away.
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Is it correct to use JavaScript Array.sort() method for shuffling?
...ading the section on poor implementations of shuffling in general, so you know what to avoid.
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back button callback in navigationController in iOS
...indexOfObject:self]==NSNotFound) {
// back button was pressed. We know this is true because self is no longer
// in the navigation stack.
}
[super viewWillDisappear:animated];
}
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Small Haskell program compiled with GHC into huge binary
... support for dynamic linking of both C and Haskell libraries. Most distros now distribute a version of GHC built to support dynamic linking of Haskell libraries. Shared Haskell libraries may be shared amongst many Haskell programs, without copying them into the executable each time.
At the time of...
Join vs. sub-query
...old-school MySQL user and have always preferred JOIN over sub-query. But nowadays everyone uses sub-query, and I hate it; I don't know why.
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