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[TypeScript] 小数点以下の桁数を指定して四捨五入する

JavaScript
TypeScript

Posted at 2021-11-30

const roundWithScale = (value: number, scale: number) => {
  return Math.round(value * 10 ** scale) / 10 ** scale;
};

roundWithScale(1.456789, 0) // 1
roundWithScale(1.456789, 1) // 1.5
roundWithScale(1.456789, 2) // 1.46
roundWithScale(1.456789, 3) // 1.457

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