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A common story that s told about the invention of the game of chess revolves around large numbers. A powerful king demanded a game he could play in his spare time, and a poor mathematician devised the game of chess for him. The king loved the game and offered the mathematician anything he would like as a reward. The mathematician said that he d like rice, distributed on his chessboard. He wanted one grain on the first square, two on the second square, four on the third square, and so on, double the amount from square to square, until the board was full. The king thought the mathematician to be a fool, as he saw how few grains it took to fill the first row of the board. Let s create a simulation of this situation with Ruby using an iterator and some interpolation: rice_on_square = 1 64.times do |square| puts "On square #{square + 1} are #{rice_on_square} grain(s)" rice_on_square *= 2 end You get the following results: On On On On On On On On square square square square square square square square 1 2 3 4 5 6 7 8 are are are are are are are are 1 grain(s) 2 grain(s) 4 grain(s) 8 grain(s) 16 grain(s) 32 grain(s) 64 grain(s) 128 grain(s)

Style is important when you re programming. Ruby programmers tend to be picky about style, and they generally adhere to a few specific guidelines, summarized here: Indentation size is two spaces. Spaces are preferred to tabs. Variables should be lowercase and underscored: some_variable, not someVariable or somevariable. Method definitions should include parentheses and no unnecessary spaces: MyClass.my_method(my_arg), not my_method( my_arg ) or my_method my_arg.

class EventsController < ApplicationController def index list render :action => 'list' end # GETs should be safe (see http://www.w3.org/2001/tag/doc/whenToUseGet.html) verify :method => :post, :only => [ :destroy, :create, :update ], :redirect_to => { :action => :list } def list @event_pages, @events = paginate :events, :per_page => 10 end def show @event = Event.find(params[:id]) end def new @event = Event.new end def create @event = Event.new(params[:event]) if @event.save flash[:notice] = 'Event was successfully created.' redirect_to :action => 'list' else render :action => 'new' end end

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Ch apt er 3 rUB Y S B U IL DING B L OC K S : Da t a , e X p r e S S I O N S , a N D F LO W C O N t r O L

squares 9 through 61 trimmed for brevity.] are 2305843009213693952 grain(s) are 4611686018427387904 grain(s) are 9223372036854775808 grain(s)

def edit @event = Event.find(params[:id]) end def update @event = Event.find(params[:id]) if @event.update_attributes(params[:event]) flash[:notice] = 'Event was successfully updated.' redirect_to :action => 'show', :id => @event else render :action => 'edit' end end def destroy Event.find(params[:id]).destroy redirect_to :action => 'list' end end

Whatever your personal style, the most important thing is to remain consistent. Nothing is worse than looking at code that switches between tabs and spaces, or mixed and lowercase variables.

By square 64, you re up to placing many trillions of grains of rice on each square! The story ends with the king realizing his position and unable to fulfill his promise. However, it proves that Ruby is able to deal with extremely large numbers, and unlike many other programming languages, there are no inconvenient limits. Other languages often have limitations on the size of numbers that can be represented. Commonly this is 32 binary bits, resulting in a limit on values to roughly 4.2 billion in languages that enforce 32-bit integers. Most operating systems and computer architectures also have similar limitations. Ruby, on the other hand, seamlessly converts between numbers that the computer can handle natively (that is, with ease) and those that require more work. It does this with different classes, one called Fixnum that represents easily managed smaller numbers, and another, aptly called Bignum, that represents big numbers Ruby needs to manage internally. On most systems, the boundary is the number 1,073,741,823 you can find it by experimenting in irb: puts 1073741823.class

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