Discussion on: Daily Challenge #2 - String Diamond

[Josh]

ruby diamonds? Okay!

def riamond(karat)
  unless karat.odd? && karat > 0
    raise ArgumentError.new("You want a #{karat} karat diamond? That's crazy!")
  end
  cut = 1
  layers = []
  until cut > karat
    layers.push(("*" * cut).center(karat))
    cut += 2
  end
  cut = karat
  until cut <= 1
    cut -= 2
    layers.push(("*" * cut).center(karat))
  end
  puts layers.join("\n")
end

alias diamond riamond # since we're gonna use "actual words" i guess

> diamond(9)
    *    
   ***   
  *****  
 ******* 
*********
 ******* 
  *****  
   ***   
    *    

> riamond(3)
 * 
***
 * 

> riamond(5)
  *  
 *** 
*****
 *** 
  *  
> riamond(-5)
# => ArgumentError (You want a -5 karat diamond? That's crazy!)

> riamond(8)
# => ArgumentError (You want a 8 karat diamond? That's crazy!)