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Showing content from http://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Unary_negation below:

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単項マイナス演算子 (-) はオペランドの前に置かれ、符号を反転します。

const x = 4;
const y = -x;

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

const a = "4";
const b = -a;

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

const x = 3;
const y = -x;

// y = -3
// x = 3

単項マイナス演算子は、数値でないものを数値に変換することができます。

const x = "4";
const y = -x;

// y = -4

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