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@dan_abramov except there is an else block, it’s just implicitly `undefined`

@forbeslindesay The idea is to have JSX expression containers have the same semantics as do expressions. @dan_abramov

@sebmck @dan_abramov but what’s the justification for do expressions. I haven’t seen any discussion on esdiscuss

@forbeslindesay Pretty sure it's from the ES4 era. Nicer than an IIFE. @dan_abramov

@forbeslindesay Also ref http://wiki.ecmascript.org/doku.php?id=strawman:do_expressions … @dan_abramov

@sebmck @dan_abramov the implicit return inside if/else etc. is very strange.

@forbeslindesay It's reusing existing completion record semantics. Same behaviour as eval etc. Most commonly used in REPLs. @dan_abramov

@sebmck @dan_abramov I think it will surprise people that `while (foo) <Element/>` doesn’t produce a list of elements