> While I agree this is interesting and should be explored further, I reject
> the proposal to add more meaning to the "!" character. Given this proposal,
> "!" would sometimes mean "not" or "negate" (as in it's current form) and
> sometimes mean "a required thing". Meanwhile, "refute" is a synonym for
> "negate", which is the opposite of what you're claiming the semantics would
> be, ie. irrefutable, "impossible to omit" or "impossible to deny [a value for
> this identifier binding]".
I agree. `+` may be a better choice (reminiscent of regular expressions as
opposed to the boolean operator). Then the code becomes:
let { +a: foo, b: bar } = { a: 1 }; // foo = 1, b = undefined
let { +a: foo, b: bar } = { }; // exception
function bla(+mandatoryArg, optionalArg1, optionalArg2 = 123) {
...
}
--
Dr. Axel Rauschmayer
a...@rauschma.de
home: rauschma.de
twitter: twitter.com/rauschma
blog: 2ality.com
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