The groovy way to see if something is in a list is to use \"in\"
if(\'b\' in [\'a\',\'b\',\'c\'])
However how do you nicely see if something
Another way to write it is with contains, e.g.
contains
if (!['a', 'b', 'c'].contains('b'))
It saves the extra level of parentheses at the cost of replacing the operator with a method call.