Exponentiation assignment (=)

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

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

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

```js interactive-example let a = 3;

console.log((a **= 2)); // Expected output: 9

console.log((a **= 0)); // Expected output: 1

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; // 25

Other non-BigInt values are coerced to numbers:

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

let foo = 3n;
foo **= 2n; // 9n
foo **= 1; // TypeError: Cannot mix BigInt and other types, use explicit conversions