Ruby: Most concise way to use an ENV variable if it exists, otherwise use default value

Question

In Ruby, I am trying to write a line that uses a variable if it has been set, otherwise default to some value:

myvar = # assign it to ENV[\'MY_VAR\'], otherw         


        

Answer 1

Another possible alternative, which will work even if ENV['MY_VAR'] turnsout to be a false value

myvar  = ENV['MY_VAR'].presence || 'foobar'