The right forms of expression
If you want to know whether your_string has at least one upper-case character, you will write this in Eiffel: if ∃ c: your_string ¦ c.is_upper then … Such predicate-calculus boolean expressions, using a quantifier ∀ (“for all”) or ∃ (“there exists”) are becoming common in Eiffel code. They are particularly useful in Design by Contract … Read more