Ruby可选参数(splat运算符)
示例
def welcome_guests(*guests) guests.each{ |guest| puts "Welcome #{guest}!" } end
welcome_guests('Tom') #欢迎汤姆! welcome_guests('Rob', 'Sally', 'Lucas') #欢迎Rob! #欢迎萨莉! #欢迎卢卡斯!
请注意,这welcome_guests(['Rob','Sally','Lucas'])将输出,Welcome["Rob","Sally","Lucas"]!
但是,如果您有列表,则可以这样做welcome_guests(*['Rob','Sally','Lucas']),并且将作为welcome_guests('Rob','Sally','Lucas')。