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

Specification
ECMAScript (ECMA-262)
The definition of 'Assignment operators' in that specification.

Browser compatibility

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See also