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Replace one character with another in Bash
...acters. It seems like bash's time complexity is worse than linear. A small test: x="$(tr -dc 'a-z \n' </dev/urandom | head -c1M)"; time y="$(tr ' ' \\- <<< "$x")"; time z="${x// /-}". With a string length of 1M (=2^20) tr took 0.04s and bash 5.0.11 took 17s. With 2M tr took 0.07s (expec...
Optional Parameters with C++ Macros
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With greatest respect to Derek Ledbetter, David Sorkovsky, Syphorlate for their answers, together with the ingenious method to detect empty macro arguments by Jens Gustedt at
https://gustedt.wordpress.com/2010/06/08/detect-empty-macr...
Inline code highlighting in reStructuredText
...le is not available in docutils 0.8.1 (which is the only version I have to test against).
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What's the difference between isset() and array_key_exists()? [duplicate]
...p; array_key_exists($key, $var)) ...
which is likely to be faster if the tests are mainly on non-null values. Otherwise for an array with mostly null values
if (isset($var) && is_array($var) && array_key_exists($key, $var)) ...
will do the work.
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How to save a git commit message from windows cmd?
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I testes everything for about half an hour till i got the fact, that entering [shift] + [z,z] brings me out of this editor in windows!! What is :wq ? I was even not able to type in another message, although i was able to delt...
Center a map in d3 given a geoJSON object
...sing mercator (WGS 84, used in google maps) for my country (Brazil), never tested using other projections and hemispheres. You may have to make adjustments for other situations, but if you nail these basic principles you will be fine.
For example, given a projection and path:
var projection = d3.g...
XPath - Selecting elements that equal a value
...works. How about accepting / upvoting ? text() is one of the possible node-tests in XPath, meaning "is this a text node?". Other nodetests are comment(), processing-instruction(), or just node().
– Dimitre Novatchev
Jul 8 '10 at 20:55
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Vagrant reverse port forwarding?
... on my host machine via its local IP address (not its loopback address). I tested by creating an http server on port 80 (and then on port 987) and curling 197.45.0.10:80 and 197.45.0.10:987 (actual ip address changed to protect the innocent). It worked both times, and I don't have any special vagran...
Auto detect mobile browser (via user-agent?) [closed]
...bile");
return (index > -1);
}
See an example at www.tablemaker.net/test/mobile.html where it triples the font size on mobile phones.
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How to convert an int to string in C?
...ngth back. I've done that here: stackoverflow.com/a/52111436/895245 + unit tests.
– Ciro Santilli 郝海东冠状病六四事件法轮功
Sep 3 '18 at 8:00
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