Exponentiation assignment (**=)

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

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Syntax

js
x **= y

Description

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

Examples

Using exponentiation assignment

js
let bar = 5;

bar **= 2; // 25
bar **= "foo"; // NaN

let foo = 3n;
foo **= 2n; // 9n

Specifications

Specification
ECMAScript Language Specification
# sec-assignment-operators

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See also