Multiplication assignment (*=)
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The multiplication assignment (*=
) operator performs multiplication on the two operands and assigns the result to the left operand.
Try it
let a = 2;
console.log((a *= 3));
// Expected output: 6
console.log((a *= "hello"));
// Expected output: NaN
Syntax
js
x *= y
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® 2025 Language Specification # sec-assignment-operators |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Multiplication assignment ( x *= y ) |
Legend
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- Full support
- Full support
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