send

dynamically call a method with unknown name

ex:

def  test_rabbit(name)

       puts name

}

a="rabbit"

send("test_#{a}", "peter")

---->  peter

1st parameter is method name,  second parameter is parameter

usage: get method from user input

note:

some_object.send(  function_name,  args )  is the same as 

some_object.function_name(args )