JavaScript Operator Precedence

Precedence Level Associates Operator Operand Types
Operation Performed
1 Left [] MemberExp Expression
Left . MemberExp Identifier
Right new MemberExp Arguments
2 Left ( ) CallExpression Arguments Function Call
Left [] CallExpression Expression
Left . CallExpression Identifier
3 n/a ++ LeftHandSideExp PostfixIncrement
n/a -- LeftHandSideExp PostfixDecrement
4 Right delete UnaryExp
Call Delete Method
Right void UnaryExp Eval and Return undefined
Right typeof UnaryExp Return Type of an Object
Right ++ UnaryExp PrefixIncrement
Right -- UnaryExp PrefixDecrement
Right + UnaryExp UnaryPlus
Right - UnaryExp UnaryMinus
Right ~ UnaryExp BitwiseNot
Right ! UnaryExp LogicalNot
5 Left * MultExp UnaryExp
Multiplication
Left / MultExp UnaryExp Division
Left % MultExp UnaryExp Remainder
6 Left + AddExp MultExp Addition
Left - AddExp MultExp Subtraction
7 Left << ShiftExp AddExp BitwiseLeftShift
Left >> ShiftExp AddExp SignedRightShift
Left >>> ShiftExp AddExp UnsignedRightShift
8 Left < RelExp ShiftExp LessThanComparison
Left > RelExp ShiftExp GreaterThanComparison
Left <= RelExp ShiftExp LessThanOrEqualComparison
Left >= RelExp ShiftExp GreaterThanOrEqualComparison
Left instanceof RelExp ShiftExp Call HasInstance Method
Left in RelExp ShiftExp Call HasProperty Method
9 Left == EqualExp RelExp IsEqual
Left != EqualExp RelExp IsNotEqual
Left === EqualExp RelExp IsStrictlyEqual
Left !== EqualExp RelExp IsStrictlyNotEqual
10 Left & BitwiseAndExp EqualExp BitwiseAnd
11 Left ^ BitwiseXorExp EqualExp Bitwise Xor
12 Left | BitwiseOrExp EqualExp BitwiseOr
13 Left && LogicalAndExp BitwiseOrExp
LogicalAnd
14 Left || LogicalOrExp LogicalAndExp
LogicalOr

15 Right ? : LogicalOrExp AssignExp AssignExp
ConditionalExpression
16 Right = LeftHandSideExp AssignExp
AssignmentExpression
Right *= LeftHandSideExp AssignExp
AssignmentWithMultiplication
Right /= LeftHandSideExp AssignExp AssignmentWithDivision
Right %= LeftHandSideExp AssignExp AssignmentWithRemainder
Right += LeftHandSideExp AssignExp AssignmentWithAddition
Right -= LeftHandSideExp AssignExp
AssignmentWithSubtraction
Right <<= LeftHandSideExp AssignExp
AssignmentWithBitwiseLeftShift
Right >>= LeftHandSideExp AssignExp
AssignmentWithSignedRightShift
Right >>>= LeftHandSideExp AssignExp
AssignmentWithUnsignedRightShift
Right &= LeftHandSideExp AssignExp AssignmentWithBitwiseAnd
Right ^= LeftHandSideExp AssignExp AssignmentWithBitwiseOr
Right |= LeftHandSideExp AssignExp AssignmentWithLogicalNot
17 Left , Expression AssignExp SequentialEvaluation
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