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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.

Try it

Syntax

x <<= y // x = x << y

Examples

Using left shift assignment

let a = 5;
// 00000000000000000000000000000101

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

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
Left_shift_assignment
1
12
1
3
3
1
1
18
4
10.1
1
1.0
1.0
0.10.0

See also

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Left_shift_assignment