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When is memoization automatic in GHC Haskell?
... in foldl' (+) 0 (y ++ [x])
GHC might notice that y does not depend on x and rewrite the function to
f = let y = [1..30000000] in \x -> foldl' (+) 0 (y ++ [x])
In this case, the new version is much less efficient because it will have to read about 1 GB from memory where y is stored, while th...
possible EventEmitter memory leak detected
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How did this answer get all these up votes, and was choosen as correct answer? even though it should work, but this is completely wrong!!
– ProllyGeek
Dec 30 '18 at 10:39
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omp parallel vs. omp parallel for
...r
specifying a parallel construct containing one worksharing construct
and no other statements. Permitted clauses are the union of the clauses
allowed for the parallel and worksharing contructs.
Taken from http://www.openmp.org/mp-documents/OpenMP3.0-SummarySpec.pdf
The specs for OpenMP are...
Git stash twice
... just call git stash pop twice. As opposed to git stash apply, pop applies and removes the latest stash.
You can also reference a specific stash, e.g.
git stash show stash@{1}
or
git stash apply stash@{1}
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How to use multiple arguments for awk with a shebang (i.e. #!)?
...sr/bin/gawk" "--re-interval" "-f" "$0" "$@", but awk treated that as a command and printed out every line of input unconditionally. That is why I put in the arbitrary_long_name==0 - it's supposed to fail all the time. You could replace it with some gibberish string. Basically, I was looking for a fa...
C pointer to array/array of pointers disambiguation
...declarators. P[N] is an array declarator. P(....) is a function declarator and *P is a pointer declarator. So everything in the following is the same as without any parentheses (except for the one of the functions' "()": int (((*p))); void ((g(void))); int *(a[1]); void (*(p())).
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Optional query string parameters in ASP.NET Web API
...isbn="", string somethingelse="", DateTime? date= null)
{
// ...
}
and everything will work out of the box.
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CSS 100% height with padding/margin
With HTML/CSS, how can I make an element that has a width and/or height that is 100% of it's parent element and still has proper padding or margins?
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Difference between \A \z and ^ $ in Ruby regular expressions
...ending on the regular expression for validation, you always want to use \A and \z. ^ and $ will only match up until a newline character, which means they could use an email like me@example.com\n<script>dangerous_stuff();</script> and still have it validate, since the regex only sees ever...
Drawable image on a canvas
...w(canvas);
This will work with all kinds of drawables, not only bitmaps. And it also means that you can re-use that same drawable again if only the size changes.
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