剰余代入 (%=)
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.
剰余代入演算子 (%=) は、変数を右辺のオペランドの値で除算し、剰余を変数に代入します。
試してみましょう
let a = 3; console.log((a %= 2)); // Expected output: 1 console.log((a %= 0)); // Expected output: NaN console.log((a %= "hello")); // Expected output: NaN 構文
js
x %= y; // x = x % y 例
剰余代入の使用
js
// 以下の変数を想定 // bar = 5 bar %= 2; // 1 bar %= "foo"; // NaN bar %= 0; // NaN 仕様書
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-assignment-operators |
