A list of stars in the block list

Question

In Ruby, I have code similar to the following

foo { |x, y| puts y }

Since the compiler / interpreter warns me about unused var X, I replaced x with "*" and the compiler stopped complaining. (I don’t know why I decided it was the best choice ... It just happened ...)

foo { |*, y| puts y }

What does it do? Are there any side effects?

Answer 1

An asterisk in this context is called the "splat" operator. This means that you can pass several parameters in their place, and the block will see them as an array.

, (, foo { |*x, y| puts y }). , , , , .