Multiplication assignment (*=) - JavaScript | MDN
Try it
let a = 2;
console.log((a *= 3));
// Expected output: 6
console.log((a *= "hello"));
// Expected output: NaN
Syntax
Description
x *= y is equivalent to x = x * y, except that the expression x is only evaluated once.
Examples
Multiplication assignment using numbers
js
let bar = 5;
bar *= 2; // 10
Other non-BigInt values are coerced to numbers:
js
let bar = 5;
bar *= "foo"; // NaN
Multiplication assignment using BigInts
js
let foo = 3n;
foo *= 2n; // 6n
foo *= 1; // TypeError: Cannot mix BigInt and other types, use explicit conversions
Specifications
| Specification |
|---|
| ECMAScript® 2027 Language Specification # sec-assignment-operators |