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Example uses of Object#tap that I really like
# Logging some action in the console or log file
# Prevents lots of references to a variable
# Maybe not the best example, but potentially cleaner than the alternative
class ApplicationController
after_filter :log_action_without_tap
after_filter :log_action_with_tap
private
def log_action_with_tap
"[ACTION LOG]: #{current_account.name} tried to #{action_name} #{controller_path}".tap{|l|
l << flash.map{|k,v| "#{k}: #{v}"}.join(',') if flash.any?
Rails.logger.info(l)
}
end
# vs
def log_action_without_tap
action_to_log = "[ACTION LOG]: #{current_account.name} tried to #{action_name} #{controller_path} "
if flash.any?
action_to_log << " || "
action_to_log << flash.map{|k,v| "#{k}: #{v}"}.join(',')
end
Rails.logger.debug(action_to_log)
end
end
# Debugging in a test
# No need to add a reference variable and new line to output
# to the console. Just tap it and call `puts` to see in the
# test output.
class LoggerTest < ActiveSupport::TestCase
def test_unknown_string_with_tap
# Just remove the tap when done
unknown_string.tap{|s| puts s}
end
def test_unknown_string_without_tap
# lots of stuff to clean up after checking console output
unknown_string = reference_to_output_being_tested
puts unknown_string # uncomment this to see output
end
end
# Use as a builder
# Allows for caching and simplifies
# of a potentially complicated object definition
@routes ||= Routes.new.tap do |route|
route.connect "some url", to: "SomeController#action"
route.connect "some other url", to: "AnotherController#action"
end.finish_and_cache!
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