減算 (-)

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.

減算演算子 (-) は 2 つのオペランドの間で減算し、それらの差を生成します。

試してみましょう

console.log(5 - 3);
// Expected output: 2

console.log(3.5 - 5);
// Expected output: -1.5

console.log(5 - "hello");
// Expected output: NaN

console.log(5 - true);
// Expected output: 4

構文

js
x - y;

数値の減算

js
5 - 3; // 2
3 - 5; // -2

非数の減算

js
"foo" - 3; // NaN

仕様書

Specification
ECMAScript® 2025 Language Specification
# sec-subtraction-operator-minus

ブラウザーの互換性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
Subtraction (-)

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

関連情報