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Most efficient method to groupby on an array of objects
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For what's it's worth, tomitrescak's solution, while convenient, is significantly less efficient, as find() is probably O(n). The solution in the answer is O(n), from the reduce (object assignment is O(1), as is push), wherea...
Iterating over each line of ls -l output
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Set IFS to newline, like this:
IFS='
'
for x in `ls -l $1`; do echo $x; done
Put a sub-shell around it if you don't want to set IFS permanently:
(IFS='
'
for x in `ls -l $1`; do echo $x; done)
Or use while | read instead:
ls -l $1 | while read x; do echo $x;...
C++ convert hex string to signed integer
...unctions, but know how to deal with a std::string
So, the simplest answer for newer code would probably look like this:
std::string s = "0xfffefffe";
unsigned int x = std::stoul(s, nullptr, 16);
NOTE: Below is my original answer, which as the edit says is not a complete answer. For a functiona...
What it the significance of the Javascript constructor property?
.... However, I think the overall gist still applies. Thanks to T. J. Crowder for pointing that out in the comments, and please read his answer for a fuller picture of the current situation.
Original answer
The constructor property makes absolutely no practical difference to anything internally. It's o...
Select random lines from a file
...random set of lines, not in a random order, then shuf is very inefficient (for big file): better is to do reservoir sampling, as in this answer.
– petrelharp
Sep 6 '15 at 23:24
1
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How to print third column to last column?
...his only works if the delimiter is exactly the same between all columns... For example, you can't use cut with a delimiter like \d+. (That I know of.)
– Zach Wily
Jan 13 '10 at 21:11
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sys.argv[1] meaning in script
...in simplified terms what the sys.argv[1] represents. Is it simply asking for an input?
9 Answers
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Adding a cross-reference to a subheading or anchor in another page
...le_) because it works across files, when section headings are changed, and for all builders that support cross-references.
RST, in General
The tools that convert RST files to HTML do not necessarily have a notion of collection. This is the case for instance if you rely on github to convert RST fi...
how to detect search engine bots with php?
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The regex in this answer is nice for being simple and wide-spanning. For my purpose I want to be quick but I don't care if there's a few false positives or false negatives.
– Gregory
Apr 6 '17 at 11:23
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Recursively remove files
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I know his question didn't ask for it, but I can never remember: does your example handle filenames with spaces?
– Grundlefleck
Jan 6 '10 at 22:41
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