const keyword scope in Javascript

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const scope is defined as ‘block scoped’ (the scope of which, is restricted to the block in which it is declared).

MDN documentation:

Constants are block-scoped, much like variables defined using the let
statement. The value of a constant cannot change through
re-assignment, and it can’t be redeclared.

Regarding your specific issue:
First as comments said const is relevant in ES6. I don’t know about you but i get (typing your line 2: var a = 3;): SyntaxError: Identifier ‘a’ has already been declared
so your example is not quite possible.

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