如何将多个参数作为数组传递给 ruby 方法？
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How do I pass multiple arguments to a ruby method as an array?
提问by Chris Drappier
I have a method in a rails helper file like this
我在这样的 rails helper 文件中有一个方法
def table_for(collection, *args)
options = args.extract_options!
...
end
and I want to be able to call this method like this
我希望能够像这样调用这个方法
args = [:name, :description, :start_date, :end_date]
table_for(@things, args)
so that I can dynamically pass in the arguments based on a form commit. I can't rewrite the method, because I use it in too many places, how else can I do this?
这样我就可以根据表单提交动态传递参数。我无法重写该方法，因为我在太多地方使用它，我还能怎么做？
回答by sean lynch
Ruby handles multiple arguments well.
Ruby 可以很好地处理多个参数。
Here isa pretty good example.
这是一个很好的例子。
def table_for(collection, *args)
p collection: collection, args: args
end
table_for("one")
#=> {:collection=>"one", :args=>[]}
table_for("one", "two")
#=> {:collection=>"one", :args=>["two"]}
table_for "one", "two", "three"
#=> {:collection=>"one", :args=>["two", "three"]}
table_for("one", "two", "three")
#=> {:collection=>"one", :args=>["two", "three"]}
table_for("one", ["two", "three"])
#=> {:collection=>"one", :args=>[["two", "three"]]}
(Output cut and pasted from irb)
（从 irb 剪切和粘贴的输出）
回答by Maximiliano Guzman
Just call it this way:
就这样称呼它：
table_for(@things, *args)
The splat(*) operator will do the job, without having to modify the method.
在splat（*）运算符将做的工作，而不必修改的方法。
回答by Anoob K Bava
class Hello
$i=0
def read(*test)
$tmp=test.length
$tmp=$tmp-1
while($i<=$tmp)
puts "welcome #{test[$i]}"
$i=$i+1
end
end
end
p Hello.new.read('johny','vasu','shukkoor')
# => welcome johny
# => welcome vasu
# => welcome shukkoor
