Division 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.
Thedivision assignment (/=) operator performsdivision on the two operands and assigns the result to the left operand.
Try it
let a = 3;a /= 2;console.log(a);// Expected output: 1.5a /= 0;console.log(a);// Expected output: Infinitya /= "hello";console.log(a);// Expected output: NaNSyntax
js
x /= yDescription
x /= y is equivalent tox = x / y, except that the expressionx is only evaluated once.
Examples
Division assignment using numbers
js
let bar = 5;bar /= 2; // 2.5bar /= 2; // 1.25bar /= 0; // InfinityOther non-BigInt values are coerced to numbers:
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let bar = 5;bar /= "2"; // 2.5bar /= "foo"; // NaNDivision assignment using BigInts
js
let foo = 3n;foo /= 2n; // 1nfoo /= 2n; // 0nfoo /= 0n; // RangeError: BigInt division by zerofoo /= 1; // TypeError: Cannot mix BigInt and other types, use explicit conversionsSpecifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |