From: william robb <otherwill@...>
Date: 2006-07-08T14:40:37+09:00
Subject: Re: newbie Q - calling a method for an object in an .each bl

Logan Capaldo wrote:
> 
> 
> It's working but #each returns the array and your #show method
> returns a string, it doesn't have any side effects. You may want to
> use map instead or use puts
> 
> e.g.:
> 
> hand.each { |c| puts c.show }
> 
> or hand.map { |c| c.show }

Ah!  These work.  Thank You!

I do recall from pickax that #each returns the array.  It must be, then, 
with

>hand.each { |c| c.show }

what I am seeing how irb displays an array.  Does this mean that the 
string returned by #show is produced, but nothing is telling it to 
display so it sort of ... gets assigned to nothing, and dosn't display 
in irb?

But, then, why doesn't the block with the puts call first display the 
strings followed by the display of the array returned by #each?

Follwing is the code defining the class (the rest I am just testing in 
irb) for hal fulton, who asked for it.  This is my first every ruby 
program so it may be ugly, and could probably be improved upon.  Been 
programming in procedural languages since fortran 77, so this OO stuff 
is a bit mind bending.  But ... I like it!

class Card

  attr_reader :suit, :value, :face

  def initialize(suit,value)
    raise(IndexError, "Card: Suite out of range: #{suit}") if suit !~ 
/[hcds]/
    @suit  = suit
    raise(IndexError, "Card: Value out of range: #{value}" ) if not 
((0..12) === value)
    @value = value
    @face = "Down"
  end

  def ssuit
    case
      when @suit == "h" then  "Hearts"
      when @suit == "c" then  "Clubs"
      when @suit == "d" then  "Diamonds"
      when @suit == "s" then  "Spades"
    end
  end


  def pips
    case @value
      when 0 .. 8 then " " + (@value+2).to_s + " "
      when 9      then  " J "
      when 10     then " Q "
      when 11     then " K "
      when 12     then " A "
    end
  end


  def show
    if @face == "Down"
      "Card: xxx xx  xxxxx"
    else
      "Card: #{pips} of #{ssuit}"
    end
  end

  def flip
    if @face == "Down"
     then @face = "Up"
     else @face = "Down"
    end
  end

end


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