The multiplication assignment (*=) operator performs multiplication 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 multiplication assignment
let bar = 5;
bar *= 2; // 10
bar *= "foo"; // NaN
let foo = 3n;
foo *= 2n; // 6n