eslint-rule-benchmark/dist/core/benchmark/calculate-statistics.js

Benchmark ESLint rules with detailed performance metrics for CI and plugin development

function calculateStatistics(samples) {
  if (samples.length === 0) {
    return {
      sampleCount: 0,
      median: 0,
      stdDev: 0,
      period: 0,
      mean: 0,
      min: 0,
      max: 0,
      p75: 0,
      p99: 0,
      hz: 0,
    }
  }
  let sortedSamples = [...samples].sort((a, b) => a - b)
  let count = sortedSamples.length
  let sum = sortedSamples.reduce((accumulator, value) => accumulator + value, 0)
  let mean = sum / count
  let min = sortedSamples[0]
  let max = sortedSamples[count - 1]
  let median
  if (count % 2 === 0) {
    median = (sortedSamples[count / 2 - 1] + sortedSamples[count / 2]) / 2
  } else {
    median = sortedSamples[Math.floor(count / 2)]
  }
  let p75Index = Math.ceil(0.75 * count) - 1
  let p99Index = Math.ceil(0.99 * count) - 1
  let p75 = sortedSamples[Math.max(0, p75Index)]
  let p99 = sortedSamples[Math.max(0, p99Index)]
  let variance =
    sortedSamples.reduce(
      (accumulator, value) => accumulator + (value - mean) ** 2,
      0,
    ) / count
  let standardDeviation = Math.sqrt(variance)
  let period = mean / 1e3
  let hz = period > 0 ? 1 / period : 0
  return {
    stdDev: standardDeviation,
    sampleCount: count,
    median,
    period,
    mean,
    min,
    max,
    p75,
    p99,
    hz,
  }
}
export { calculateStatistics }