Access numeric properties of an object using dot notation

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Your question seems to be about why we can’t access array and array-like elements using the dot notation like this:

const v = a.0;

It’s described in the ECMAScript specification:

The dot notation is explained by the following syntactic conversion:

MemberExpression . IdentifierName

And identifiers may not start with a digit as described here:

IdentifierName ::
IdentifierStart
IdentifierName IdentifierPart
IdentifierStart ::
UnicodeLetter
$
_
\ UnicodeEscapeSequence

As for the reasoning, having identifier names just being made of digits would have made it difficult to write number literals. An exception could probably have been designed just for array access but that would have made the language more complex and departing from the common C family syntax without any real gain.

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