It's an implementation error. In Firefox, it correctly throws: > ReferenceError:... | Hacker News

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egeozcan on June 1, 2015 | parent | context | favorite | on: How necessary are var, let, and const?

It's an implementation error. In Firefox, it correctly throws:

> ReferenceError: can't access lexical declaration `a' before initialization

titzer on June 2, 2015 [–]

No, legacy const is not spec'd by ES5. It behaves differently in FireFox and V8 because it was added at different times with different semantics in the live range hole case. In strict mode, it will throw on V8 as well.

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