denoBenchToBenchmarkJsOutput.ts

import { BenchmarkRunResult } from "https://deno.land/std/testing/bench.ts";

function typicalDeviation(data: number[]) {
  const avg = data.reduce((a, b) => a + b) / data.length;
  const squareDiffs = data.map((value) => {
    const diff = value - avg;
    const sqrDiff = diff * diff;
    return sqrDiff;
  });
  const avgSquareDiff = squareDiffs.reduce((a, b) => a + b) / data.length;
  const stdDev = Math.sqrt(avgSquareDiff);
  return stdDev;
}

export function denoBenchToBenchmarkJsOutput(result: BenchmarkRunResult) {
  return result.results.map((r) => ({
    opsPerSec: Math.round(1000 / r.measuredRunsAvgMs),
    error: Math.round(typicalDeviation(r.measuredRunsMs) * 100) / 100,
    name: r.name,
    runs: r.runsCount,
  })).map((r) =>
    `${r.name} x ${r.opsPerSec} ops/sec ±${r.error}% (${r.runs} runs sampled)`
  ).join("\n");
}