Question

I have a variable that will have the following values:

blah = # 1, 0, or -1

Now I want to set these two variables:

up

down

To either 1 or 0 based on the value of ‘blah’.

If blah is 1, then up = 1 and down = 0, if blah is -1 then down = 1 and up = 0

If blah is 0, then both are 0.

How can you do this the ruby way w/o so many if checks?

Answer 1

Solution 1

up, down =
case blah
when 1; [1, 0]
when 0; [0, 0]
when -1; [0, 1]
end

Solution 2 (Inspired by mu is too short)

up, down = [[0, 0], [1, 0], [0, 1]][blah]