Access to the number as an object

Question

Can anyone describe to which mechanism relates this behavior: When i try access to property of number

2.constructor

I get Uncaught SyntaxError: Invalid or unexpected token

When i try access to property of number in this way

(1).constructor

I get

ƒ Number() { [native code] }

Answer 1

You need another dot to distinguish the first decimal separator from a dot as a property accessor.

console.log(2..constructor);