Unsigned right shift assignment (>>>=)

Baseline Widely available

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

The unsigned right shift assignment (>>>=) operator performs unsigned 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; // -00000000000000000000000000000101

b >>>= 2; //  00111111111111111111111111111110
console.log(b);
// Expected output: 1073741822

Syntax

x >>>= y

Description

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

Examples

Using unsigned right shift assignment

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

let b = -5; // (-00000000000000000000000000000101)
b >>>= 2; // 1073741822 (00111111111111111111111111111110)

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

Specifications

Specification
ECMAScript® 2027 Language Specification # sec-assignment-operators

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`unsigned_right_shift_assignment`	1	12	1	3	1	18	4	10.1	1	1.0	4.4	1	1.0.0	1.0	0.10.0