Groovy not in collection

Question

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

Answer 1

Regarding one of the original answers:

if (!['a', 'b', 'c'].contains('b'))

Somebody mentioned that it is easy to miss the ! because it's far from the method call. This can be solved by assigning the boolean result to a variable and just negate the variable.

def present = ['a', 'b', 'c'].contains('b')
if (!present) {
    // do stuff
}