prettyoutput/benchmark/stats.js

Librarie to format js/json objects into a YAML-style colored output. Especially useful to pretty print logs. Performant (benchmarks)

'use strict'

const _ = require('lodash')

const fixedInt = (exports.fixedInt = function(v) {
    return Math.floor(v)
})

/**
 *
 * @param {number} time - in nano seconds
 */
exports.prettyTime = function(time) {
    const mn = fixedInt(time / 1e12)
    const s = fixedInt(time / 1e9) - fixedInt(mn * 1e3)
    const ms = fixedInt(time / 1e6) - fixedInt(mn * 1e6) - fixedInt(s * 1e3)
    const micros = fixedInt(time / 1e3) - fixedInt(mn * 1e9) - fixedInt(s * 1e6) - fixedInt(ms * 1e3)
    const ns = fixedInt(time) - fixedInt(mn * 1e12) - fixedInt(s * 1e9) - fixedInt(ms * 1e6) - fixedInt(micros * 1e3)

    let result = ''
    if (mn != 0) result += ` ${mn} mn`
    if (s != 0) result += ` ${s} s`
    if (ms != 0) result += ` ${ms} ms`
    if (micros != 0) result += ` ${micros} µs`
    if (ns != 0) result += ` ${ns} ns`

    return result
}

exports.stats = function(diffs) {
    let min = diffs[0]
    let max = diffs[0]
    let total = 0

    _.forEach(diffs, diff => {
        min = Math.min(min, diff)
        max = Math.max(max, diff)
        total += diff
    })

    let mean = total / diffs.length
    return { min, max, mean, total }
}

exports.prettyStats = function(stats) {
    const result = {}
    result.min = exports.prettyTime(stats.min)
    result.max = exports.prettyTime(stats.max)
    result.mean = exports.prettyTime(stats.mean)
    result.total = exports.prettyTime(stats.total)

    return result
}