Kevin Smith wrote:
Would we? This is something a little different than "irrefutable property get". Thinking...Notice that, strictly speaking, we don't need an "irrefutable object" operation:let v = ?o.p; // is equivalent to: let v = {o}.?o.p; The allocation in "{o}" can be statically optimized away. The same goes for the pattern language: let ?{ p: v } = o; // is equivalent to: let { ?o: { p: v } } = {o};
Sure, but that's crying out for a shorter form that avoids repeating o. Note also that in the expression language, |o| might be a longer expression (even, gasp, with embedded effects) that you would not want to repeat.
Whatever we do for existential operators, destructuring in ES6 with refutable-by-default patterns wants something at all levels, including outermost -- or so I argue.
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