http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax
"This works because Expression is a cover grammar for FormalParameterList, with Identifier primary expressions covering formal parameter names, array and object literals for destructuring, assignment for parameter default values, and spread for rest parameters." This does not work for rest parameter since ... is only allowed inside array literals. var tail = (x, ...xs) => xs; This can of course be solved in numerous ways but it is not true that the Expression is a cover grammar for FormalParameterList. Another option is to allow ...expression in an expression which would have the same semantics as a comma expression where the expression has been spread: ...expression desugars to var $tmp = expression; ($tmp[0], $tmp[1], ..., $tmp[$tmp.length - 1]) but that is kind of useless. -- erik _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
