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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 >>>= 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® 2026 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