find the standard deviation of all elements in an array in javascript

index.tsx
function standardDeviation(arr) {
  const n = arr.length;
  const mean = arr.reduce((acc, val) => acc + val, 0) / n;
  const variance = arr.reduce((acc, val) => acc + (val - mean) ** 2, 0) / n;
  const stdDev = Math.sqrt(variance);
  return stdDev;
}
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index.tsx
const myArray = [2, 4, 6];
const result = standardDeviation(myArray);
console.log(result); // output: 1.63299...
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