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(def b (nil? s))b = s.empty();var b = string.IsNullOrEmpty(s);final b = s.isEmpty;b := s == ""Strings cannot be nil
let b = !!sboolean b = s.intern() == "";If you're comparing a String reference to a String literal, you can use the equality operator if you "intern" the reference.
boolean b = s.equals("");b := (s = '');The brackets are optional.
b = not sb = s == ''b = s.empty?