Andreas Rossberg wrote:
(OTOH, I'd prefer finding a way to do guards with single ':'... :-) )
I started there too (ES4, ML which was used [SML] for the ES4 reference
implementation, other work such as Links). But TC39 argued about it and
the desire to guard property names in object literals led us to favor ::.
let guardedObj = {p1::t1: v1, ~~~ pN::tN: vN};
Using : is ambiguous (using :, a property assignment, assuming optional
guards, could have p:t or p:v or p:t:v). I suggested requiring
parenthesization:
let guardedObj = {(p1:t1): v1 ~~~ (pN:tN): vN};
but no one liked that! Since :: was only twice as bad as :, and Haskell
used it, we agreed to :: for guards.
/be
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