Right shift assignment (>>=)

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since July 2015.

Learn more
See full compatibility

The right shift assignment (>>=) operator performs right shift on the two operands and assigns the result to the left operand.

Try it

let a = 5; //  00000000000000000000000000000101

a >>= 2; //  00000000000000000000000000000001
console.log(a);
// Expected output: 1

let b = -5; //  11111111111111111111111111111011

b >>= 2; //  11111111111111111111111111111110
console.log(b);
// Expected output: -2

Syntax

x >>= y

Description

x >>= y is equivalent to x = x >> y, except that the expression x is only evaluated once.

Examples

Using right shift assignment

let a = 5; //   (00000000000000000000000000000101)
a >>= 2; //   1 (00000000000000000000000000000001)

let b = -5; //  (-00000000000000000000000000000101)
b >>= 2; //  -2 (-00000000000000000000000000000010)

let c = 5n;
c >>= 2n; // 1n