Extract Variable（提取变量）
def calculate(value)
value * 0.07
end
To
SALES_TAX = 0.07
def calculate(value)
value * SALES_TAX
end
content.gsub(/\s+$/, '')
To
TRAILING_WHITESPACE_PATTERN = /\s+$/
content.gsub(TRAILING_WHITESPACE_PATTERN, '')
Extract Method（提取方法）
def show_sample?(video)
video.has_sample? && \
current_user.present? && !current_user.subscriber?
end
To
def show_sample?(video)
video.has_sample? && sampler?
end
private
def sampler?
current_user.present? && !current_user.subscriber?
end
Convert Comment to Method（方法替代注释）
# find the user based on the email in the params
user = User.find_by(email: params[:user_email])
To
user = find_user_by_email_param
# elsewhere in file
def find_user_by_email_param
User.find_by(email: params[:user_email])
end
Examples
# Parses a URL for a `return_to` path.
class ReturnPathFinder
def initialize(url)
@url = url
end
def return_path
query_string['return_to']
end
private
attr_reader :url
def query_string
Rack::Utils.parse_nested_query(parsed_url.query)
end
def parsed_url
URI.parse(url)
end
end
ReturnPathFinder.new(auth_origin).return_path
