Asignación de sustracción (-=)
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.
El operador de asignación de sustracción (-=
) realiza una resta en los dos operandos y asigna el resultado al operando izquierdo.
Pruébalo
let a = 2;
console.log((a -= 3));
// Expected output: -1
console.log((a -= "Hello"));
// Expected output: NaN
Sintaxis
js
x -= y
Descripción
x -= y
es equivalente a x = x - y
, exepto que la expresión x
se evalúa una sola vez.
Ejemplos
Usando el operador de asignación de sustracción
js
let bar = 5;
bar -= 2; // 3
bar -= "foo"; // NaN
let foo = 3n;
foo -= 2n; // 1n
Especificaciones
Specification |
---|
ECMAScript® 2025 Language Specification # sec-assignment-operators |
Compatibilidad con navegadores
Report problems with this compatibility data on GitHubdesktop | mobile | server | ||||||||||||
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Subtraction assignment ( x -= y ) |
Legend
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- Full support
- Full support
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.