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Bitwise OR assignment

The bitwise OR assignment operator (|=) uses the binary representation of both operands, does a bitwise OR operation on them and assigns the result to the variable.

Syntax

Operator: x |= y
Meaning:  x = x | y

Examples

Using bitwise OR assignment

let a = 5;
a |= 2; // 7
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
// -----------------------------------
// 7: 00000000000000000000000000000111

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Bitwise OR assignment (x |= y) 1 12 1 3 3 1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Bitwise OR assignment (x |= y) 1 18 4 10.1 1 1.0
Server
Node.js
Bitwise OR assignment (x |= y) 0.1.100

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://wiki.developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_OR_assignment