The left shift assignment (<<=) operator performs left shift on the two operands and assigns the result to the left operand.
Syntax
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