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MySQL vs MongoDB 1000 reads
...ve been testing it lately. I had a table called posts in MySQL with about 20 million records indexed only on a field called 'id'.
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Get index of array element faster than O(n)
...['a', 'b', 'c']
hash = Hash[array.map.with_index.to_a] # => {"a"=>0, "b"=>1, "c"=>2}
hash['b'] # => 1
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Difference between CouchDB and Couchbase
...he Software Foundation and is released under the Apache License, Version 2.0 (DFSG-compatible, FSF-approved, OSI-approved, GPL-compatible, non-copyleft, commercial-friendly).
Philosophy
I have never seen it directly pointed out but this may be actually the most important difference between those t...
Wrap long lines in Python [duplicate]
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def fun():
print(('{0} Here is a really long '
'sentence with {1}').format(3, 5))
Adjacent string literals are concatenated at compile time, just as in C. http://docs.python.org/reference/lexical_analysis.html#string-literal-concate...
Rerender view on browser resize with React
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javac : command not found
...he OpenJDK Development Environment. You can install java-devel or java-1.6.0-openjdk-devel, which both include javac.
By the way: you can find out which package provides javac with a yum search, e.g.
su -c 'yum provides javac'
on more recent releases of CentOS e.g. 6 the command changes to
su -...
Highlight the difference between two strings in PHP
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edited Jul 11 at 20:11
Toby Allen
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an...
What is the difference between the remap, noremap, nnoremap and vnoremap mapping commands in Vim?
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answered Sep 23 '10 at 7:24
DrAlDrAl
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Crop MP3 to first 30 seconds
...and it also takes longer to do.
Here's a command line that will slice to 30 seconds without transcoding:
ffmpeg -t 30 -i inputfile.mp3 -acodec copy outputfile.mp3
The -acodec switch tells ffmpeg to use the special "copy" codec which does not transcode. It is lightning fast.
NOTE: the command w...
Understanding offsetWidth, clientWidth, scrollWidth and -Height, respectively
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The CSS box model is rather complicated, particularly when it comes to scrolling content. While...