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 julio de 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

x -= y

x -= y es equivalente a x = x - y, exepto que la expresión x se evalúa una sola vez.

js
let bar = 5;

bar -= 2; // 3
bar -= "foo"; // NaN

let foo = 3n;
foo -= 2n; // 1n

Specification

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This page was last modified on 11 feb 2025 by MDN contributors.