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How to force the browser to reload cached CSS/JS files?
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Update: Rewritten to incorporate suggestions from John Millikin and da5id. This solution is written in PHP, but should be easily adapted to other languages.
Update 2: Incorporating comments from Nick Johnson that the original .htaccess regex can cause problems with files like json-1.3.js. Solu...
How to automatically install Emacs packages by specifying a list of package names?
... a list of package names in .emacs file and then package could automatically search and install the packages, so that I don't need to install them manually by calling M-x package-list-packages . How to do that?
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Collections.emptyMap() vs new HashMap()
...e collection - it's generally just inferred from the context of the method call.
They're more efficient because they don't bother creating new objects; they just re-use an existing empty and immutable object. This effect is generally very minor, but it's occasionally (well, rarely) important.
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Applying a function to every row of a table using dplyr?
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is it possible to add the values of a dynamically formed datatframe? So in this data frame the column names are not known. I am able to add if column names are known.
– Arun Raja
May 4 '15 at 7:49
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How can I troubleshoot my Perl CGI script?
...is expecting the first output from a CGI script to be the CGI header. Typically that might be as simple as print "Content-type: text/plain\n\n"; or with CGI.pm and its derivatives, print header(). Some servers are sensitive to error output (on STDERR) showing up before standard output (on STDOUT)....
Why does “pip install” inside Python raise a SyntaxError?
...talled package so this is the right way of using the API: subprocess.check_call([sys.executable, '-m', 'pip', 'install', 'SomeProject']) but since Python allows to access internal API and you know what you're using the API for you may want to use internal API anyway eg. if you're building own GUI pa...
Is it possible to make relative link to image in a markdown file in a gist?
... part varies per file (a quick experimentation confirms it is the git blob id). However you can drop that part resulting in a URL pointing to the latest version:
https://gist.github.com/user/605560c2961cb3025038/raw/img.png
or to take a working example:
https://gist.githubusercontent.com/cben/4...
What does the comma operator , do?
...point will i have the values 5, 4, 3, 2 or 1. It is simply 0. It's practically useless unless the expressions have side effects.
– Jeff Mercado
Nov 13 '10 at 7:06
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Execute a command line binary with Node.js
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For even newer version of Node.js (v8.1.4), the events and calls are similar or identical to older versions, but it's encouraged to use the standard newer language features. Examples:
For buffered, non-stream formatted output (you get it all at once), use child_process.exec:
const ...
Remove empty elements from an array in Javascript
...ill return you a new array with the elements that pass the criteria of the callback function you provide to it.
For example, if you want to remove null or undefined values:
var array = [0, 1, null, 2, "", 3, undefined, 3,,,,,, 4,, 4,, 5,, 6,,,,];
var filtered = array.filter(function (el) {...