To be honest, the lack of it existing in javascript aside, statements-as-expressions is a useful thing - no need to remember the semantics of `if {} else {}` vs

To be honest, the lack of it existing in javascript aside, statements-as-expressions is a useful thing - no need to remember the semantics of `if {} else {}` vs `? :`, ability to have very complex (multi-line) expressions, and in languages with RAII, blocks being expressions means it's easy and clear to be able to acquire a resource in order to calculate a single value.