autocallback.coffee

# Automatically return the callback if errored
e = (cb1, cb2)-> return (err, args...)-> if err then cb1 err else cb2 args...

# Demo
div = (num1, num2, callback)->
  try
    callback null, num1 / num2
  catch err
    callback err

# Outer function
main = (cb)->
  # Divide some numbers
  div 10, 2, e cb, (result)->
    console.log result

  div 15, 3, e cb, (result)->
    console.log result

  div 20, 0, e cb, (result)->
    console.log result

# Go!
main (err)->
  console.error err