Ruby bits (method 篇)

Outline

1. 1. 目錄 (method 篇)
2. 2. 1. OPTIONAL ARGUMENTS （給予參數初始值）
3. 3. 2. HASH ARGUMENTS（參數太長）
   1. 3.1. better
   2. 3.2. Keys are optional
   3. 3.3. Complete hash is optional
4. 4. 3. “SPLAT” ARGUMENTS

目錄 (method 篇)

1. OPTIONAL ARGUMENTS
2. HASH ARGUMENTS
3. “SPLAT” ARGUMENTS

1. OPTIONAL ARGUMENTS （給予參數初始值）

# bad
def tweet(message, lat, long)
  ...
end
tweet("Practicing Ruby-Fu!", nil, nil)

# good
deftweet(message,lat=nil long=nil)
  ...
end
tweet("Practicing Ruby-Fu!")

2. HASH ARGUMENTS（參數太長）

def tweet(message, options = {})
  status = Status.new
  status.lat = options[:lat]
  status.long = options[:long]
  status.body = message
  status.reply_id = options[:reply_id]
  status.post
end

tweet("Practicing Ruby-Fu!",
  :lat => 28.55,
  :long => -81.33,
  :reply_id => 227946
)

better

tweet("Practicing Ruby-Fu!",
  lat: 28.55,
  long: -81.33,
  reply_id: 227946
)

Keys are optional

tweet("Practicing Ruby-Fu!",
  lat: 28.55,
)

Complete hash is optional

tweet("Practicing Ruby-Fu!")

3. “SPLAT” ARGUMENTS

def mention(status, *names)
  tweet("#{names.join(' ')} #{status}")
end

mention('Your courses rocked!', 'eallam', 'greggpollack', 'jasonvanlue')
=> eallam greggpollack jasonvanlue Your courses rocked!