ECMAScript® 2024 Language Specification

Draft ECMA-262 / July 26, 2023

13.9 Bitwise Shift Operators

Syntax

ShiftExpression[Yield, Await] : AdditiveExpression[?Yield, ?Await] ShiftExpression[?Yield, ?Await] << AdditiveExpression[?Yield, ?Await] ShiftExpression[?Yield, ?Await] >> AdditiveExpression[?Yield, ?Await] ShiftExpression[?Yield, ?Await] >>> AdditiveExpression[?Yield, ?Await]

13.9.1 The Left Shift Operator ( << )

Note

Performs a bitwise left shift operation on the left operand by the amount specified by the right operand.

13.9.1.1 Runtime Semantics: Evaluation

ShiftExpression : ShiftExpression << AdditiveExpression
  1. Return ? EvaluateStringOrNumericBinaryExpression(ShiftExpression, <<, AdditiveExpression).

13.9.2 The Signed Right Shift Operator ( >> )

Note

Performs a sign-filling bitwise right shift operation on the left operand by the amount specified by the right operand.

13.9.2.1 Runtime Semantics: Evaluation

ShiftExpression : ShiftExpression >> AdditiveExpression
  1. Return ? EvaluateStringOrNumericBinaryExpression(ShiftExpression, >>, AdditiveExpression).

13.9.3 The Unsigned Right Shift Operator ( >>> )

Note

Performs a zero-filling bitwise right shift operation on the left operand by the amount specified by the right operand.

13.9.3.1 Runtime Semantics: Evaluation

ShiftExpression : ShiftExpression >>> AdditiveExpression
  1. Return ? EvaluateStringOrNumericBinaryExpression(ShiftExpression, >>>, AdditiveExpression).