@small-tech/jsdb/lib/Time.js

A zero-dependency, transparent, in-memory, streaming write-on-update JavaScript database for Small Web applications that persists to a JavaScript transaction log.

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Time class.
//
// A very simple timer that supports high precision time and labels.
//
// Like this? Fund us!
// https://small-tech.org/fund-us
//
// Copyright ⓒ 2020-2021 Aral Balkan. Licensed under AGPLv3 or later.
// Shared with ♥ by the Small Technology Foundation.
//
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import { performance } from 'perf_hooks'

export default class Time {

  static labels = {}

  static mark (label = 'global') {
    this.labels[label] = performance.now()
    return this.labels[label]
  }

  // By default, elapsed will return the time as a string
  // with three decimal places of precision. If you want
  // a full precision number instead, pass a negative value
  // as the only argument. Any positive number will attempt
  // to return the answer to that level of precision.
  static elapsed (label = 'global', precision = 3) {
    const endTime = performance.now()
    const duration = endTime - this.labels[label]
    this.labels[label] = endTime
    return precision < 0 ? duration : duration.toFixed(precision)
  }
}