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What does the `forall` keyword in Haskell/GHC do?
...["Hello", "World"]
2
How is that different from Rank-N-Types?
ghci> :set -XRankNTypes
ghci> length (["Hello", "World"] :: forall a. [a])
Couldnt match expected type 'a' against inferred type '[Char]'
...
With Rank-N-Types, forall a meant that your expression must fit all possible ...
Remove accents/diacritics in a string in JavaScript
...ould. However, this allows you to substitute for another diacritics map by setting the value of changes to it.
– Ryan Rapp
Dec 5 '12 at 17:41
...
Extract substring in Bash
... The number '2' after '-f' is to tell shell to extract the 2nd set of substring.
– Sandun
Jul 10 '18 at 13:42
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show 2 more comm...
What are the main purposes of using std::forward and which problems it solves?
...reference, that is, in which case you want to do so, too.
Try to write a set of outer() functions which implement this without rvalue references, deducing the right way to pass the arguments from inner()'s type. I think you'll need something 2^2 of them, pretty hefty template-meta stuff to deduce ...
An example of how to use getopts in bash
...e case of unsupported option, : in the case of missing value.
OPTARG - is set to current argument value,
OPTERR - indicates if Bash should display error messages.
So the code can be:
#!/usr/bin/env bash
usage() { echo "$0 usage:" && grep " .)\ #" $0; exit 0; }
[ $# -eq 0 ] && usa...
What is the correct way to get a subarray in Scala?
...e.ArrayBuffer
val sub_array = ArrayBuffer[Array[String]]()
val columns_subset: Seq[String] = Seq("ColumnA", "ColumnB", "ColumnC")
val columns_original = original_array(0)
for (column_now <- columns_subset) {
sub_array += original_array.map{_(columns_original.indexOf(column_now))}
}
su...
What does template mean?
... editor after snippets, if snippets enabled
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How to generate keyboard events in Python?
...some programs use the scan code even if KEYEVENTF_SCANCODE
# isn't set in dwFflags, so attempt to map the correct code.
if not self.dwFlags & KEYEVENTF_UNICODE:
self.wScan = user32.MapVirtualKeyExW(self.wVk,
MAPVK_VK_TO...
How to delete a specific line in a file?
Let's say I have a text file full of nicknames. How can I delete a specific nickname from this file, using Python?
17 Answe...
What is a unix command for deleting the first N characters of a line?
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