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lang-js
i
IS known everywhere in the function-block! It starts asundefined
(due to hoisting) until you assign a value! ps:let
is also hoisted (to the top of it's containing block), but will give aReferenceError
when referenced in the block before first assignment. (ps2: I'm a pro-semicolon kinda guy but you really don't need a semicolon after a block ). That being said, thanks for adding the reality-check regarding support!let
andvar
!let
andconst
were recommended to only use when you actually need their additional functionality, because enforcing/checking these extra features (like write-only const) result in 'more work' (and additional scope-nodes in the scope-tree) for the (current)engine(s) to enforce/check/verify/setup.