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| -rw-r--r-- | lib/observer.rb | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/observer.rb b/lib/observer.rb index acfe654301..0078d81449 100644 --- a/lib/observer.rb +++ b/lib/observer.rb @@ -111,6 +111,30 @@ # Current price: 112 # Current price: 79 # --- Sun Jun 09 00:10:25 CDT 2002: Price below 80: 79 +# +# === Usage with procs +# +# The +#notify_observers+ method can also be used with +proc+s by using +# the +:call+ as +func+ parameter. +# +# The following example illustrates the use of a lambda: +# +# require 'observer' +# +# class Ticker +# include Observable +# +# def run +# # logic to retrieve the price (here 77.0) +# changed +# notify_observers(77.0) +# end +# end +# +# ticker = Ticker.new +# warner = ->(price) { puts "New price received: #{price}" } +# ticker.add_observer(warner, :call) +# ticker.run module Observable # |