Reverse a string each two characters with Ruby

Question

I want to reverse a string each two characters with Ruby.

The input:

"0123456789abcdef"

The output that I expect:

"efcdab8967452301"

Answer 1

I'm not sure if this is the best way to do it:

"0123456789abcdef".scan(/../).reverse.join == "efcdab8967452301"

Answer 2

"0123456789abcdef".gsub(/../, &:reverse).reverse
# => "efcdab8967452301"