Question

I am new to ruby on rails and started a tutorial and found out the following function

 def string_shuffle(s)
>>   s.split('').?.?
>> end
=> nil
>> string_shuffle("foobar")

What does s.split('').?.? do? I know the split method but i have no idea what the two question marks are for. I saw “? used in boolean methods, but i couldnt understand how this one works. I tried to google it but, I couldnt find it at all.

Answer 1

To quote the tutorial in question:

By replacing the question marks in Listing 4.10 with the appropriate
methods, combine split, shuffle, and join to write a function that
shuffles the letters in a given string.

Listing 4.10 is an exercise where the two question marks are meant to be replaced with actual method calls.