Penny add a few helper properties to generate currency from numbers.
See /examples to see how it works.
Operations on amounts of same currency:
require 'penny'
e = 100.EUR.add 11.50.EUR
console.log "#{e}"
d = 100.USD.sub 50.USD
console.log #{d}"which should print :
+111.5€ # in green
-$50 # in yellow
There are also shortcuts for big numbers:
console.log "#{400.K.USD}"
console.log "#{1.M.EUR}"
console.log "#{1.B.USD}"