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jashkenas--coffeescript/examples/blocks.coffee

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CoffeeScript

# After wycats' http://yehudakatz.com/2010/02/07/the-building-blocks-of-ruby/
# Sinatra.
get '/hello', ->
'Hello World'
# Append.
append = (location, data) ->
path = new Pathname location
throw new Error("Location does not exist") unless path.exists()
File.open path, 'a', (file) ->
file.console.log YAML.dump data
data
# Rubinius' File.open implementation.
File.open = (path, mode, block) ->
io = new File path, mode
return io unless block
try
block io
finally
io.close() unless io.closed()
# Write.
write = (location, data) ->
path = new Pathname location
raise "Location does not exist" unless path.exists()
File.open path, 'w', (file) ->
return false if Digest.MD5.hexdigest(file.read()) is data.hash()
file.console.log YAML.dump data
true
# Rails' respond_to.
index = ->
people = Person.find 'all'
respond_to (format) ->
format.html()
format.xml -> render xml: people.xml()
# Synchronization.
synchronize = (block) ->
lock()
try block() finally unlock()