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list.clear() vs list = new ArrayList(); [duplicate]
Which one of the 2 options is better and faster to clear an ArrayList, and why?
8 Answers
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Large, persistent DataFrame in pandas
... sets and the file format is in hdf5.
So the processing time is relatively fast.
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How to keep up with the latest versions of Node.js in Ubuntu? PPA? Compiling?
...of node, you may have to upgrade it a few weeks or months later due to the fast paced development of node. NVM makes it easier to upgrade, while at the same time enabling migration of previously installed global npm packages. Run this command to upgrade:
nvm install node --reinstall-packages-from=n...
Remove the last line from a file in Bash
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This is by far the fastest and simplest solution, especially on big files:
head -n -1 foo.txt > temp.txt ; mv temp.txt foo.txt
if You want to delete the top line use this:
tail -n +2 foo.txt
which means output lines starting at line 2...
Python: List vs Dict for look up table
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A dict is a hash table, so it is really fast to find the keys. So between dict and list, dict would be faster. But if you don't have a value to associate, it is even better to use a set. It is a hash table, without the "table" part.
EDIT: for your new question, ...
Find merge commit which include a specific commit
...s merged into feature, then immediately feature is merged into master as a fast-forward (tip of feature replaces master). Would that cause --first-parent to return the wrong parent?
– Kelvin
Jul 9 '13 at 17:54
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move_uploaded_file gives “failed to open stream: Permission denied” error
...applies to situations where you might of changed the servers php type from fast_CGI, CGI to Apache_mod as plesk etc.. can continue with original user's permissions not apache. This fixed my issues.
– elliotrock
Oct 16 '14 at 4:31
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Should I write script in the body or the head of the html? [duplicate]
...peed). The user's perception is their reality—if it is perceived to load faster, it does load faster (even though stuff might still be occurring in code).
EDIT: references:
asp.net discussion: http://west-wind.com/weblog/posts/154797.aspx
and here: http://msdn.microsoft.com/en-us/library/3hc29e...
memcpy() vs memmove()
...n compiler/libraries.)
In general, memcpy is implemented in a simple (but fast) manner. Simplistically, it just loops over the data (in order), copying from one location to the other. This can result in the source being overwritten while it's being read.
Memmove does more work to ensure it handles...
Android -Starting Service at Boot Time
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Same as the above but really simple and fast, use this one if u come by this post.
– dbkoren
Aug 16 '13 at 10:28
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