有人测试了 JS 中所有循环的速度！来看看JS 中最快的循环是什么？

console.time ('描述信息') 
// 要测量的代码
console.timeEnd ('描述信息')
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// 生成随机数据
const numbersList = Array.from({ length: 50_000_000 }, () =>
  Math.floor(Math.random() * 100)
)

// For 循环
const usingForLoop = async (array) => {
  console.time('For 循环')

  const newNumbersList = []
  for (let i = 0; i < array.length; i++) {
    newNumbersList.push(array[i])
  }

  console.timeEnd('For 循环')
}

// While 循环
const usingWhile = async (array) => {
  console.time('WHILE')

  let i = 0
  const newNumbersList = []
  while (i < array.length) {
    newNumbersList.push(array[i])
    i++
  }

  console.timeEnd('WHILE')
}

// Do-While 循环
const usingDoWhile = async (array) => {
  console.time('DO WHILE')

  let i = 0
  const newNumbersList = []
  do {
    newNumbersList.push(array[i])
    i++
  } while (i < array.length)

  console.timeEnd('DO WHILE')
}

// For-Of 循环
const usingForOf = async (array) => {
  console.time('FOR OF')

  const newNumbersList = []
  for (const item of array) {
    newNumbersList.push(item)
  }

  console.timeEnd('FOR OF')
}

// ForEach 循环
const usingForEach = async (array) => {
  console.time('forEach')

  const newNumbersList = []
  array.forEach((item) => newNumbersList.push(item))

  console.timeEnd('forEach')
}

// Map 循环
const usingMap = async (array) => {
  console.time('map')

  const newNumbersList = array.map((number) => number)

  console.timeEnd('map')
}

// Filter 循环
const usingFilter = async (array) => {
  console.time('filter')

  const newNumbersList = array.filter((item) => true)

  console.timeEnd('filter')
}

// Reduce 循环
const usingReduce = async (array) => {
  console.time('reduce')

  const newNumbersList = array.reduce((acc, item) => {
    acc.push(item)
    return acc
  }, [])

  console.timeEnd('reduce')
}

// Some 循环
const usingSome = async (array) => {
  console.time('some')

  const newNumbersList = []
  array.some((item) => {
    newNumbersList.push(item)
    return false
  })

  console.timeEnd('some')
}

// Every 循环
const usingEvery = async (array) => {
  console.time('every')

  const newNumbersList = []
  array.every((item) => {
    newNumbersList.push(item)
    return true
  })

  console.timeEnd('every')
}

// Find 循环
const usingFind = async (array) => {
  console.time('find')

  const newNumbersList = []
  array.find((item) => {
    newNumbersList.push(item)
    return false
  })

  console.timeEnd('find')
}

// 执行循环操作
;(async () => {
  await usingForLoop(numbersList)
  await usingWhile(numbersList)
  await usingDoWhile(numbersList)
  await usingForOf(numbersList)
  await usingForEach(numbersList)
  await usingMap(numbersList)
  await usingFilter(numbersList)
  await usingReduce(numbersList)
  await usingSome(numbersList)
  await usingEvery(numbersList)
  await usingFind(numbersList)
})()
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