find the standard deviation of all values in a map in typescript

index.ts
variance = 1/n * sum((x - mean)^2)
standard deviation = sqrt(variance)
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3 lines

index.ts
function calculateStandardDeviation(map: Map<any, number>): number {
  const valuesArray = Array.from(map.values());
  const sum = valuesArray.reduce((acc, val) => acc + val, 0);
  const mean = sum / valuesArray.length;
  const variance = valuesArray.reduce((acc, val) => acc + Math.pow(val - mean, 2), 0) / valuesArray.length;
  const standardDeviation = Math.sqrt(variance);
  return standardDeviation;
}
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