[Ruby] Splat operator
expand array items into individual arguments.
>> ar
=> ["a", "b"]
>> ar.class
=> Array
>> def ar_in(*args)
>> puts args, args.length
>> end
without splat
?> ar_in(ar)
a
b
1
this is what we want
>> ar_in('a', 'b')
a
b
2
>> ar_in(*ar)
a
b
2
