Ruby: Swap Variables in Oneline

In Ruby, there is a way to swap values of two different variables without using temporary variables.

Let's say there are two variables that we'd like to swap.

a = 100
b = 200

The naive way to implement swap(x, y) is using tmp variable to store either of variable values temporary.

tmp = a
a = b
b = tmp

But if you use Ruby's parallel assignments, the above code can be written as follows:

a, b = b, a