Multiplication assignment (=)

main Documentación oficial Licencia CC-BY-SA-2.5Descargado el 2026-08-02

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The multiplication assignment (*=) operator performs multiplication on the two operands and assigns the result to the left operand.

{{InteractiveExample("JavaScript Demo: Multiplication assignment (*=) operator")}}

```js interactive-example let a = 2;

console.log((a *= 3)); // Expected output: 6

console.log((a *= "hello")); // Expected output: NaN

## Syntax

```js-nolint
x *= y

Description#

x *= y is equivalent to x = x * y, except that the expression x is only evaluated once.

let bar = 5;
bar *= 2; // 10

Other non-BigInt values are coerced to numbers:

let bar = 5;
bar *= "foo"; // NaN

let foo = 3n;
foo *= 2n; // 6n
foo *= 1; // TypeError: Cannot mix BigInt and other types, use explicit conversions