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Why is “origin/HEAD” shown when running “git branch -r”?
When you run git branch -r why the blazes does it list origin/HEAD ? For example, there's a remote repo on GitHub, say, with two branches: master and awesome-feature. If I do git clone to grab it and then go into my new directory and list the branches, I see this:
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My docker container has no internet
...nd all.
sudo service docker restart or (if you are in a linux distro that does not use upstart) sudo systemctl restart docker
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How to make a phone call using intent in Android?
...s the user to decide whether to actually make the call or not. ACTION_DIAL does not require the CALL_PHONE permission.
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Use email address as primary key?
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String comparison is slower than int comparison. However, this does not matter if you simply retrieve a user from the database using the e-mail address. It does matter if you have complex queries with multiple joins.
If you store information about users in multiple tables, the foreign k...
What does FrameLayout do?
...arched, but I couldn't find something useful. What is FrameLayout and what does it do?
5 Answers
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What is Virtual DOM?
...t. It contains all the details needed to construct the DOM, but because it doesn't require all the heavyweight parts that go into a real DOM, it can be created and changed much more easily.
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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
...oice in this particular case and on my machine. Clang 3.4 (trunk) with -O3 does the appropriate alignment and the generated code does not show this weird behavior.
Of course, if an inappropriate alignment is done, it makes things worse. An unnecessary / bad alignment just eats up bytes for no reaso...
Convert PDF to clean SVG? [closed]
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Inkscape doesn't work too well, as it changes the text into paths, too. I also find that they often lose the font data, but don't seem to approximate a good, installed font. How does PDF display it if SVG can't?
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Convert Unix timestamp to a date string
...is solution works with versions of date which do not support date -d @. It does not require AWK or other commands. A Unix timestamp is the number of seconds since Jan 1, 1970, UTC so it is important to specify UTC.
date -d '1970-01-01 1357004952 sec UTC'
Mon Dec 31 17:49:12 PST 2012
If you are on...
NSUserDefaults - How to tell if a key exists
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objectForKey: will return nil if it doesn't exist.
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