a[]b ++ c fails to compile

[quarterto]

Unexpected ','

[duralog]

can you explain what you expected the output to be? I'm pretty sure that's wrong... you have not said your index. a[0]b ++ c will compile

[normalser]

There is nothing wrong with what @quarterto is trying to do.
It should compile to (a.b || (a.b = [])).concat(c)

[quarterto]

Search for "semiautovivification" in the docs. a[]b ensures b exists as an array on a.

[duralog]

wow! you are right... that should exist... however in my opinion it actually should not.. because it's one thong to say x instanceof MyObj and another thing to say typeoof x === 'object' -- so I would actually like this syntax to be kiiled for obvious reasons

[vendethiel]

Also, a[]b + c works.