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Editorial Team
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Asked: 2026-05-27T12:51:05+00:00

When trying to access the property a of the object {} {}.a I get

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When trying to access the property a of the object {}

{}.a

I get the error

SyntaxError: Unexpected token .

With parens all is fine:

({}).a

Why do I get an error in the fist place? Is there ambiguity?

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1 Answer

  1. Editorial Team

    The curly braces are interpreted as a block statement, not as an object literal. You cannot begin an expression statement with a left curly brace.

    The specification states:

    NOTE An ExpressionStatement cannot start with an opening curly brace
    because that might make it ambiguous with a Block. Also, an
    ExpressionStatement cannot start with the function keyword because
    that might make it ambiguous with a FunctionDeclaration.

    Source: http://es5.github.com/x12.html#x12.4

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