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In Jinja2, how do you test if a variable is undefined?
... {% if variable is defined and variable %} would also check for emptiness
– Vivek
May 17 '19 at 9:00
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Elegant way to check for missing packages and install them?
I seem to be sharing a lot of code with coauthors these days. Many of them are novice/intermediate R users and don't realize that they have to install packages they don't already have.
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How to run Gulp tasks sequentially one after the other
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Method of choice for all newcomers. They should really start with gulp 4, skipping all 3.* hassle and wide range of antipatterns.
– metalim
Apr 6 '16 at 21:51
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slashes in url variables
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You can use encodeURIComponent and decodeURIComponent for this purpose.
– Keavon
Jun 26 '17 at 19:17
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What is the “right” JSON date format?
I've seen so many different standards for the JSON date format:
16 Answers
16
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Remove files from Git commit
...This can be done like Paritosh Singh suggested:
git reset --soft HEAD^
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git reset --soft HEAD~1
Then reset the unwanted files in order to leave them out from the commit:
git reset HEAD path/to/unwanted_file
Now commit again, you can even re-use the same commit message:
git commit -c ORI...
How do I set up HttpContent for my HttpClient PostAsync second parameter?
...ng value of the response, the encoding, and the media type in the constructor. See: http://msdn.microsoft.com/en-us/library/system.net.http.stringcontent.aspx
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Remove an onclick listener
...do a check of the status in the OnClickListener and then determine whether or not the click should do something vs adding and clearing click listeners.
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Programmatically change the src of an img tag
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For simple things like setting the value of an input or changing an image src (especial when you're using elements that have IDs), you really should try to avoid jQuery, since the call is so much slower than the pure JS call
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Get application version name using adb
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That does show me the package info but for some reason it is missing the version information for any package I have tried to look up on my tablet (android 2.2). On my phone all the version information is there (android 2.3).
– frognosis
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