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authorUser <bnewbold@daemon.robocracy.org>2009-10-13 02:52:09 +0000
committerUser <bnewbold@daemon.robocracy.org>2009-10-13 02:52:09 +0000
commitf61026119df4700f69eb73e95620bc5928ca0fcb (patch)
treef17127cff9fec40f4207d9fa449b9692644ce6db /software/ruby
parent9d431740a3e6a7caa09a57504856b5d1a4710a14 (diff)
downloadknowledge-f61026119df4700f69eb73e95620bc5928ca0fcb.tar.gz
knowledge-f61026119df4700f69eb73e95620bc5928ca0fcb.zip
Grand rename for gitit transfer
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-==================
-Ruby
-==================
-
-.. note:: This information is very rough, it's mostly my notes about what is
- different about Ruby syntax compared to similar modern interpreted
- pan-paradigm languages like Python.
-
-A unique intro to ruby is `"Why's Poignant Guide to Ruby"`__, a web-comic-y
-short free online book by why the luck stiff. The more serious reference is
-the "pickax" book.
-
-__ http://poignantguide.net/
-
-Blocks
----------
-Blocks of code can be passed to functions, making ruby code more of a first
-order data type.
-
-Ranges
-----------
-
->>> 2..7 # => 2..7
->>> (2..7).to_a # => [2, 3, 4, 5, 6, 7]
->>> (2...7).to_a # => [2, 3, 4, 5, 6]
->>> ('e'..'h').to_a # => ["e", "f", "g", "h"]
-
-Control Structures
---------------------
-Can use ``if`` after a statement::
-
->>> a = c if c > b
-
-Along with the usual ``break`` and ``next``, there is ``redo`` which redoes
-the current loop (initial conditions may have been changed).
-
-
-Boolean Operators
---------------------
-Anything that is not ``nill`` or ``false`` is true. To force interpretation
-as boolean, use ``!!`` (not not)::
-
->>> !!(nil) # => false
->>> !!(true) # => true
->>> !!('') # => true
->>> !!(0) # => true
->>> !!({}) # => true
-
-
-Misc
-----------------
-Can use nasty Perl style regular expression stuff::
-
->>> re1 = /\d+/
->>> "There are 5 kilos of chunky bacon on the table!" =~ re1 # => 10, the index
->>> $~ # => #<MatchData:0xb7c36754>
->>> $~.pre_hash # => "There are "
-
-Also $1, $2, etc.
-
-The "splat operator", '*', either collects or expands extra arguments depending
-on syntax (I think this is kind of icky)::
-
->>> a, b = 1, 2, 3, 4 # a=1, b=2
->>> a, *b = 1, 2, 3, 4 # a=1, b=[2,3,4]
->>> c, d = 5, [6, 7, 8] # c=5, d=[6,7,8]
->>> c, d = 5, *[6, 7, 8] # c=5, b=6