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Left shift assignment

The left shift assignment operator (<<=) moves the specified amount of bits to the left and assigns the result to the variable.

Syntax

Operator: x <<= y
Meaning:  x   = x << y

Examples

Using left shift assignment

let a = 5; 
// 00000000000000000000000000000101

a <<= 2; // 20
// 00000000000000000000000000010100

Specifications

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Left shift 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
Left shift assignment (x <<= y) 1 18 4 10.1 1 1.0
Server
Node.js
Left shift 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/Left_shift_assignment