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Editorial Team
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Asked: 2026-06-04T22:05:03+00:00

Based on the official ECMA-262 edition 5.1 June 2011 standard : The grammar summary

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Based on the official ECMA-262 edition 5.1 June 2011 standard:

The grammar summary defines that a grouping operator(parentheses) may only contain an expression:

PrimaryExpression :

this
Identifier
Literal
ArrayLiteral
ObjectLiteral
( Expression )

And an expression can only be an Assignmentexpression(or a sequence of those)(scroll to the end of section A.3)

Expression :

AssignmentExpression
Expression , AssignmentExpression

So according to the ECMA-262 edition 5.1 the following should be incorrect: (FunctionExpression).

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  1. Editorial Team

    After a bit of digging I figured out it is actually valid. Here is the complete derivation(to retrace it go to the end of section A.3 and follow the derivations upwards starting from Expression:

    Expression -> AssignmentExpression -> ConditionalExpression ->
LogicalORExpression -> LogicalANDExpression -> 
BitwiseORExpression -> BitwiseXORExpression -> 
BitwiseANDExpression -> EqualityExpression -> 
RelationalExpression -> ShiftExpression -> AdditiveExpression -> 
MultiplicativeExpression -> UnaryExpression -> 
PostfixExpression -> LeftHandSideExpression -> NewExpression -> 
MemberExpression -> FunctionExpression
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