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How to check if a Ruby object is a Boolean
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class X; def !; self end end ; x = X.new ; !!x == x #=> true
– Alexey
Jun 7 '12 at 12:08
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How to enable cross-origin resource sharing (CORS) in the express.js framework on node.js
...while still providing static files from a public directory. I'm using the express.js and am not really sure how to allow cross-domain scripting ( Access-Control-Allow-Origin: * ).
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How to set JAVA_HOME environment variable on Mac OS X 10.9?
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Literally all you have to do is:
echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile
and restart your shell.
If you have multiple JDK versions installed and you want it to be a specific one, you can use the -v flag to java_home like so:
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How to render a DateTime in a specific format in ASP.NET MVC 3?
...roperty of type DateTime how can I render it in a specific format - for example in the format which ToLongDateString() returns?
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Check if a value exists in pandas dataframe index
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This should do the trick
'g' in df.index
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`date` command on OS X doesn't have ISO 8601 `-I` option?
... Yup, awesome answer Thanks!, but this date -u +"%Y-%m-%dT%H:%MZ" exactly I was looking for.
– ChikuMiku
Jan 7 '17 at 14:55
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Run javascript function when user finishes typing instead of on key up?
I want to trigger an ajax request when the user has finished typing in a text box. I don't want it to run the function on every time the user types a letter because that would result in A LOT of ajax requests, however I don't want them to have to hit the enter button either.
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How can I see the current value of my $PATH variable on OS X?
...o use the command echo $PATH to display the PATH variable or you can just execute set or env to display all of your environment variables.
By typing $PATH you tried to run your PATH variable contents as a command name.
Bash displayed the contents of your path any way. Based on your output the fol...
Meaning of tilde in Linux bash (not home directory)
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It's a Bash feature called "tilde expansion". It's a function of the shell, not the OS. You'll get different behavior with csh, for example.
To answer your question about where the information comes from: your home directory comes from the variable $HOME (no m...
Putting a simple if-then-else statement on one line [duplicate]
I'm just getting into Python and I really like the terseness of the syntax. However, is there an easier way of writing an if - then - else statement so it fits on one line?
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