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How to modify a specified commit?
... @ is shorthand for HEAD, and ~ is the commit before the specified commit.
Read more about rewriting history in the Git docs.
Don't be afraid to rebase
ProTip™: Don't be afraid to experiment with "dangerous" commands that rewrite history* — Git doesn't delete your commits for 90 days by defa...
Rails: How can I set default values in ActiveRecord?
...efining defaults in your migration also works part of the time... As has already been mentioned this will not work when you just call Model.new.
Overriding initialize can work, but don't forget to call super!
Using a plugin like phusion's is getting a bit ridiculous. This is ruby, do we really need ...
Maximum size of an Array in Javascript
Context: I'm building a little site that reads an rss feed, and updates/checks the feed in the background. I have one array to store data to display, and another which stores ID's of records that have been shown.
...
When to use the different log levels
...servers must serve requests in a finite amount of time, or exist in multithreaded and/or server environments that might be difficult to instrument, or the bug might be rare enough that a debugger isn't an option. Or you don't know what you're looking for.
– Thanatos
...
Why can't C++ be parsed with a LR(1) parser?
I was reading about parsers and parser generators and found this statement in wikipedia's LR parsing -page:
6 Answers
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How to create a trie in Python
...'m interested in tries and DAWGs (direct acyclic word graph) and I've been reading a lot about them but I don't understand what should the output trie or DAWG file look like.
...
Check if an apt-get package is installed and then install it if it's not on Linux
...hello package the second dpkg after apt remove shows that he package has already been removed without --purge:
dpkg-query: package 'hello' is not installed and no information is available
The documentations are also very unclear, e.g.:
sudo apt dselect-upgrade
did not remove certbot when it wa...
What's the difference between “STL” and “C++ Standard Library”?
...82:2014 (and earlier versions, such as ISO/IEC 14882:2011).
The STL was already widely used as a library for C++, giving programmers access to containers, iterators and algorithms. When the standardisation happened, the language committee designed parts of the C++ Standard Library (which is part of...
Passing arrays as parameters in bash
...rray variables could have local scope
local descTable=(
"sli4-iread"
"sli4-iwrite"
"sli3-iread"
"sli3-iwrite"
)
local optsTable=(
"--msix --iread"
"--msix --iwrite"
"--msi --iread"
"--msi --iwrite"
)
takes_ary_...
String output: format or concat in C#?
...ook: " + (cElapsedMilliseconds) + "ms - " + (cElapsedTicks) + " ticks");
Thread.Sleep(4000);
Those are my results:
1000000 x result = string.Format("{0} {1}", p.FirstName, p.LastName); took: 618ms - 2213706 ticks
1000000 x result = (p.FirstName + " " + p.LastName); took: 166ms - 595610 ticks...