Run results for: math standard deviation

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.111 Safari/537.36

Browser: Chrome 86

Operating system: Mac OS X 10.14.3

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
std1 - mathjs	1204042.0 Ops/sec
std2	4708430.0 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/mathjs/7.5.1/math.js'></script>

Script Preparation code:

function std1(arr) {
	return math.std(arr)
}

function std2(arr) {
    if(arr.length === 1) return 0;

  	let sum = 0, varianceSum = 0;

  	for(let i=0; i<arr.length; i++) {
      sum += arr[i];
    }

	const mean = sum / arr.length;

  	for(let i=0; i<arr.length; i++) {
      	let x = arr[i] - mean;
    	varianceSum += x*x;
    }

  	const sampleVariance = varianceSum / (arr.length - 1);

	return Math.sqrt(sampleVariance);
}

Tests:

std1 - mathjs
std1([1,2,3,4])
std2
std2([1,2,3,4])

Run results for: math standard deviation

std1 - mathjs

std2