From: Daniel Lucraft <dan@...>
Date: 2007-07-19T18:29:18+09:00
Subject: Re: Overwriting "if"

Matthew Rudy wrote:
> I want to overwrite if,
> Any amusing suggestions on how to implement this will be much welcomed.
> 
> MatthewRudy

Be like Smalltalk!

irb> class Object
irb>  def if
irb>   if self
irb>    yield
irb>   end
irb>  end
irb> end
=> nil

irb> (4==4).if { p :true }
:true
=> nil
irb> (4==6).if { p :true }
=> nil

irb> class Object
irb>  def if(blocks)
irb>   if self
irb>    blocks[:then].call
irb>   else
irb*    blocks[:else].call
irb>   end
irb>  end
irb> end
=> nil

irb> (4==4).if :then => lambda { p :true }, :else => lambda { p :false }
:true
=> nil
irb> (4==6).if :then => lambda { p :true }, :else => lambda { p :false }
:false
=> nil
irb>


Be like Arc!!

irb> alias fn lambda
=> nil
irb> (4==6).if :then => fn { p :true }, :else => fn { p :false }
:false
=> nil



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