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Message: [QUOTE="Bertram Scharpf, post: 4656410"] Hi, Am Montag, 04. Jan 2010, 13:38:08 +0900 schrieb Kvetch Kvetch: As in SQL, 0 does not yield false. SQL's NULL is different from 0 and from ''. So is in Ruby `nil' different from 0, from "", and from [], and further from {}. In C you're free to write if (num % 7) { ... } That won't work in Ruby. `Numeric#nonzero?' has been mentioned. Of course, I cannot resist and just mention my beloved proposal of `String#notempty?', `Array#notempty?', and `Hash#notempty?'. `Bertram::NotEmpty#insists?' still returns `true'. Bertram [/QUOTE]