I see this has been discussed on this list a number of times before -- I found this thread <https://esdiscuss.org/topic/new-assignment-operators-not-bit-wise-or>, and reviewed the linked discussions and previous strawmen (I hope that link is enough to establish context and why the operator is useful; I can provide more insight if it would be helpful). I understand the problem is fraught and thorny, but I believe the language would greatly benefit from it.
I spent some time reflecting on what I think would be expected of such an operator (most notably that it be as close to the other assignment operators +=, -= &c. and the || operator as I could manage, and that it match the ||= operator in Ruby <http://www.rubyinside.com/what-rubys-double-pipe-or-equals-really-does-5488.html> fairly closely) and wrote up a quick reference implementation (-ish? see babylon (parser) <https://github.com/doug-wade/babylon/tree/conditional-assignment> and babel (compiler) <https://github.com/doug-wade/babel/tree/babel-plugin-transform-conditional-assignment>) and an set of test cases <https://github.com/doug-wade/conditional-assignment-tests> to match what I think expresses my thoughts on what I personally would expect from such an operator more eloquently than I think I could in words (please don't think me presumptuous; I thought it easier to write out my thoughts in code than English, not that the debate would be so simple that my implementation would be rubber stamped). I have reviewed the process documentation <https://tc39.github.io/process-document/> and the contributing guide <https://github.com/tc39/ecma262/blob/master/CONTRIBUTING.md>, and I believe I am seeking a TC39 champion to make this a stage 0 strawman proposal, though I will admit that from my review of the archives <https://esdiscuss.org/> there is likely to be a lot of discussion before we reach that point. Please advise me as to what more I can do to get this included in the ES standard. All the best, Doug Wade
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