Programming language notes, links


Time machine

Here is a post for years and years ago that was stuck in drafts. Some of it is still useful, but a lot is amusing to look back on. Oh, those were the days ...


General Programming

Lots of good multi-language examples at this site. It's nice for comparing how similar algorithms are implemented in different languages.

  http://en.literateprograms.org/


This is an awesome page, full of useful and interesting bit-twiddling tricks. In particular, with the trick to count set bits in a word, I've been able to reduce by a factor of 50 (!) the amount of time it takes to count bits in a range of memory.

  http://graphics.stanford.edu/~seander/bithacks.html

Lots of information about regular expressions: http://swtch.com/~rsc/regexp/

Programming Challenges


Sites to keep you in shape:


Mathematics

The Haskell implementation of the Sieve of Eratosthenes is just cryptic. I'm not sure how a functional style of programming helps. It's much more complex that a straightforward implementation (like in Scala) would be.

  http://en.literateprograms.org/Sieve_of_Eratosthenes_(Haskell)
  http://en.literateprograms.org/Sieve_of_Eratosthenes_(Scala)


This is a nice overview of various ways to calculate Fibonacci numbers:

  http://atgcio.blogspot.ca/2013/01/computing-fibonacci.html


Go

Well worth a read if you're interested in the motivations behind Go.


Ruby


The ruby equivalent of Perl's Data::Dumper() is pp (pretty print):

   require 'pp'
   d = [6, 28, 496, 8192, {:a => 1}]
   pp d



   optparse - parsing of command line options
   ostruct - creations of "structures" on the fly. It's really just a class layered on top of hashes, but with a convenient syntax for setting and getting attribute values.





To profile a Ruby app, no changes to your Ruby code are needed. And you'll discover the bottleneck isn't where you hoped it would be.




  ruby -rprofile file.rb

C++

Google style guides:


  http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml
  http://google-styleguide.googlecode.com/svn/trunk/cpplint/cpplint.py







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