Round number with X decimals (toFixed VS Math.round)

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toFixed
const formatNumber = (x, fractionDigits) => {
  return Number(x.toFixed(fractionDigits ?? 3).replace(/\.?0*$/, ''))
}
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Math.round
const formatNumber = (x, fractionDigits) => {
  const powed = Math.pow(10, fractionDigits ?? 2)
  return Math.round(Number(String(x).replace(/,/gi, '.')) * powed) / powed
}
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