Question

I have three variables all of which can be nil:

to
cc
bcc

How can I assign X to any one of the to/cc/bcc given that any one of them can be nil (but not all three)? It seems ugly to do

if to.nil? and cc.nil?
   X = bcc
elsif ...

You can’t do

 X = to or cc or bcc 

either.

Answer 1

Yo can do this:

X = (to or cc or bcc)

Or this:

X = to || cc || bcc

|| has higher precedence than =, or — lower, so first example doesn’t work without parentheses, X is just unconditionally assigned to first variable.