Left shift assignment (<<=)
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The left shift assignment (<<=) operator performs left shift on the two operands and assigns the result to the left operand.
{{InteractiveExample("JavaScript Demo: Left shift assignment (<<=) operator", "shorter")}}
```js interactive-example let a = 5; // 00000000000000000000000000000101
a <<= 2; // 00000000000000000000000000010100
console.log(a); // Expected output: 20
## Syntax
```js-nolint
x <<= y
Description#
x <<= y is equivalent to x = x << y, except that the expression x is only evaluated once.
Examples#
Using left shift assignment#
let a = 5;
// 00000000000000000000000000000101
a <<= 2; // 20
// 00000000000000000000000000010100
let b = 5n;
b <<= 2n; // 20n
Specifications#
{{Specifications}}
Browser compatibility#
{{Compat}}