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

BCD tables only load in the browser

関連情報