I have a method in a rails helper file like this
def table_for(collection, *args)
options = args.extract_options!
...
end
and I want to be able to call this method like this
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?
Ruby handles multiple arguments well.
Here is a pretty good example.
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)
Just call it this way:
table_for(@things, *args)
The splat (*) operator will do the job, without having to modify the method.
method(*['a', '', nil].compact_blank)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
i is defined here as global variable. it will be set to zero only once, when class is loaded. so second run of read function will never work.