#benchmark

基准测试

const { performance } = require('perf_hooks');

var mapLoop = function(arr, callback){
  return arr.map(callback)
}

var forLoop = function(arr, callback){
  for(let i=0; i < arr.length; i++){
    callback(arr[i], i, arr)
  }
}

var run = function(name, times, fn, arr, callback){
  var start = performance.now()

  for(let i=0; i<times; i++){
    fn(arr, callback)
  }

  var end = performance.now()
  console.log('Running %s %d times cost %d ms', name, times, end - start)
}

var testArr = [0, 1, 2, 3, 4, 5, 6]
var callback = d => d
run('mapLoop', 10000000, mapLoop, testArr, callback)
run('forLoop', 10000000, forLoop, testArr, callback)