Let's Learn Return
Sometimes we don't just want a method to print something to the console,
but we actually want that method to hand us (or another method!) back a
value. For that, we use return.
def double(n)
return n * 2
end
output = double(6)
output += 2
puts output
1. In the example above, we define a new method called double that
accepts one argument called n.
2. Inside the method, we return two times n.
3. After that, we call our new double method with an argument of 6 and
store the result, 12, in output.
4. Then, we increase output to 14 and print it out to the console.
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