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 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
js
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
js
let a = 5; // (00000000000000000000000000000101)
a >>= 2; // 1 (00000000000000000000000000000001)
let b = -5; // (-00000000000000000000000000000101)
b >>= 2; // -2 (-00000000000000000000000000000010)
let c = 5n;
c >>= 2n; // 1n
Specifications
Specification |
---|
ECMAScript® 2025 Language Specification # sec-assignment-operators |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Right shift assignment ( x >>= y ) |
Legend
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- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.