switch-object-array-benchmark.js

const os = require('os')
const Benchmark = require('benchmark') // https://github.com/bestiejs/benchmark.js

console.log(`cpu: ${os.cpus()[0].model}`)
console.log(`NodeJS version: ${process.version}`)
console.log(`platform: ${os.platform()}`)
console.log()

const suite = new Benchmark.Suite()

const func1 = function (sourceLevel) {
  let level
  switch (sourceLevel) {
    case 1: level = 'VERBOSE'; break
    case 2: level = 'DEBUG'; break
    case 3: level = 'INFO'; break
    case 4: level = 'WARN'; break
    case 5: level = 'ERROR'; break
    case 6: level = 'FATAL'; break
    default: level = 'USERLVL'
  }
  return level
}

const obj = {
  1: 'VERBOSE',
  2: 'DEBUG',
  3: 'INFO',
  4: 'WARN',
  5: 'ERROR',
  6: 'FATAL'
}

const func2 = function (sourceLevel) {
  return obj[sourceLevel]
}

const array = [ null, 'VERBOSE', 'DEBUG', 'INFO', 'WARN', 'ERROR', 'FATAL' ]

const func3 = function (sourceLevel) {
  return array[sourceLevel]
}

// add tests
suite
  .add('switch', () => { // "switch x 1,181,888 ops/sec ±0.30% (96 runs sampled)"
    const a = func1(1)
    const e = func1(5)
    const d = func1(4)
    const c = func1(3)
    const b = func1(2)
    const f = func1(6)
  })
  .add('obj', () => { // "obj x 565,235 ops/sec ±0.19% (95 runs sampled)"
    const a = func2(1)
    const e = func2(5)
    const d = func2(4)
    const c = func2(3)
    const b = func2(2)
    const f = func2(6)
  })
  .add('array', () => { // "array x 538,314 ops/sec ±5.08% (88 runs sampled)"
    const a = func3(1)
    const e = func3(5)
    const d = func3(4)
    const c = func3(3)
    const b = func3(2)
    const f = func3(6)
  })
  // add listeners
  .on('cycle', (event) => {
    console.log(String(event.target))
  })
  .on('complete', () => {
    console.log()
    console.log('Fastest is ' + suite.filter('fastest').map('name'))
  })
  // run async
  .run({ 'async': true })