无标题文章

各大语法性能差异
http://incaseofstairs.com/six-speed/
let array = [
['1', '', 'title1', 1, 2, 3],
['2', '', 'title2', 4, 5, 6],
['11', '1', 'title3', 7, 8, 9],
['21', '2', 'title4', 10, 11, 12],
['22', '2', 'title5', 13, 14, 15],
['111', '11', 'title6', 16, 17, 18],
['211', '21', 'title7', 19, 20, 21],
['2111', '211', 'title8', 22, 23, 24],
['3', '', 'title8', 22, 23, 24],
['31', '3', 'title8', 22, 23, 24],
['311', '31', 'title8', 22, 23, 24],
['3111', '311', 'title8', 22, 23, 24],
['31111', '3111', 'title8', 22, 23, 24],
['311111', '31111', 'title8', 22, 23, 24],
['3111111', '311111', 'title8', 22, 23, 24],
['31111111', '3111111', 'title8', 22, 23, 24],
['311111111', '31111111', 'title8', 22, 23, 24],
['3111111111', '311111111', 'title8', 22, 23, 24],
['31111111111', '3111111111', 'title8', 22, 23, 24],
['311111111111', '31111111111', 'title8', 22, 23, 24],
['3111111111111', '311111111111', 'title8', 22, 23, 24],
['31111111111111', '3111111111111', 'title8', 22, 23, 24],
['311111111111111', '31111111111111', 'title8', 22, 23, 24],
['3111111111111111', '311111111111111', 'title8', 22, 23, 24],
['31111111111111111', '3111111111111111', 'title8', 22, 23, 24],
['311111111111111111', '31111111111111111', 'title8', 22, 23, 24],
['3111111111111111111', '311111111111111111', 'title8', 22, 23, 24],
['31111111111111111111', '3111111111111111111', 'title8', 22, 23, 24],
['311111111111111111111', '31111111111111111111', 'title8', 22, 23, 24],
['4', '', 'title8', 22, 23, 24],
['41', '4', 'title8', 22, 23, 24],
['411', '41', 'title8', 22, 23, 24],
['4111', '411', 'title8', 22, 23, 24],
['41111', '4111', 'title8', 22, 23, 24],
['411111', '41111', 'title8', 22, 23, 24],
['4111111', '411111', 'title8', 22, 23, 24],
['41111111', '4111111', 'title8', 22, 23, 24],
['411111111', '41111111', 'title8', 22, 23, 24],
['4111111111', '411111111', 'title8', 22, 23, 24],
['41111111111', '4111111111', 'title8', 22, 23, 24],
['411111111111', '41111111111', 'title8', 22, 23, 24],
['4111111111111', '411111111111', 'title8', 22, 23, 24],
['41111111111111', '4111111111111', 'title8', 22, 23, 24],
['411111111111111', '41111111111111', 'title8', 22, 23, 24],
['4111111111111111', '411111111111111', 'title8', 22, 23, 24],
['41111111111111111', '4111111111111111', 'title8', 22, 23, 24],
['411111111111111111', '41111111111111111', 'title8', 22, 23, 24],
['4111111111111111111', '411111111111111111', 'title8', 22, 23, 24],
['41111111111111111111', '4111111111111111111', 'title8', 22, 23, 24],
['411111111111111111111', '41111111111111111111', 'title8', 22, 23, 24],
['5', '', 'title8', 22, 23, 24],
['51', '5', 'title8', 22, 23, 24],
['511', '51', 'title8', 22, 23, 24],
['5111', '511', 'title8', 22, 23, 24],
['51111', '5111', 'title8', 22, 23, 24],
['511111', '51111', 'title8', 22, 23, 24],
['5111111', '511111', 'title8', 22, 23, 24],
['51111111', '5111111', 'title8', 22, 23, 24],
['511111111', '51111111', 'title8', 22, 23, 24],
['5111111111', '511111111', 'title8', 22, 23, 24],
['51111111111', '5111111111', 'title8', 22, 23, 24],
['511111111111', '51111111111', 'title8', 22, 23, 24],
['5111111111111', '511111111111', 'title8', 22, 23, 24],
['51111111111111', '5111111111111', 'title8', 22, 23, 24],
['511111111111111', '51111111111111', 'title8', 22, 23, 24],
['5111111111111111', '511111111111111', 'title8', 22, 23, 24],
['51111111111111111', '5111111111111111', 'title8', 22, 23, 24],
['511111111111111111', '51111111111111111', 'title8', 22, 23, 24],
['5111111111111111111', '511111111111111111', 'title8', 22, 23, 24],
['51111111111111111111', '5111111111111111111', 'title8', 22, 23, 24],
['511111111111111111111', '51111111111111111111', 'title8', 22, 23, 24],
['6', '', 'title8', 22, 23, 24],
['61', '6', 'title8', 22, 23, 24],
['611', '61', 'title8', 22, 23, 24],
['6111', '611', 'title8', 22, 23, 24],
['61111', '6111', 'title8', 22, 23, 24],
['611111', '61111', 'title8', 22, 23, 24],
['6111111', '611111', 'title8', 22, 23, 24],
['61111111', '6111111', 'title8', 22, 23, 24],
['611111111', '61111111', 'title8', 22, 23, 24],
['6111111111', '611111111', 'title8', 22, 23, 24],
['61111111111', '6111111111', 'title8', 22, 23, 24],
['611111111111', '61111111111', 'title8', 22, 23, 24],
['6111111111111', '611111111111', 'title8', 22, 23, 24],
['61111111111111', '6111111111111', 'title8', 22, 23, 24],
['611111111111111', '61111111111111', 'title8', 22, 23, 24],
['6111111111111111', '611111111111111', 'title8', 22, 23, 24],
['61111111111111111', '6111111111111111', 'title8', 22, 23, 24],
['611111111111111111', '61111111111111111', 'title8', 22, 23, 24],
['6111111111111111111', '611111111111111111', 'title8', 22, 23, 24],
['61111111111111111111', '6111111111111111111', 'title8', 22, 23, 24],
['611111111111111111111', '61111111111111111111', 'title8', 22, 23, 24],
['7', '', 'title8', 22, 23, 24],
['71', '7', 'title8', 22, 23, 24],
['711', '71', 'title8', 22, 23, 24],
['7111', '711', 'title8', 22, 23, 24],
['71111', '7111', 'title8', 22, 23, 24],
['711111', '71111', 'title8', 22, 23, 24],
['7111111', '711111', 'title8', 22, 23, 24],
['71111111', '7111111', 'title8', 22, 23, 24],
['711111111', '71111111', 'title8', 22, 23, 24],
['7111111111', '711111111', 'title8', 22, 23, 24],
['71111111111', '7111111111', 'title8', 22, 23, 24],
['711111111111', '71111111111', 'title8', 22, 23, 24],
['7111111111111', '711111111111', 'title8', 22, 23, 24],
['71111111111111', '7111111111111', 'title8', 22, 23, 24],
['711111111111111', '71111111111111', 'title8', 22, 23, 24],
['7111111111111111', '711111111111111', 'title8', 22, 23, 24],
['71111111111111111', '7111111111111111', 'title8', 22, 23, 24],
['711111111111111111', '71111111111111111', 'title8', 22, 23, 24],
['7111111111111111111', '711111111111111111', 'title8', 22, 23, 24],
['71111111111111111111', '7111111111111111111', 'title8', 22, 23, 24],
['711111111111111111111', '71111111111111111111', 'title8', 22, 23, 24],
['8', '', 'title8', 22, 23, 24],
['81', '8', 'title8', 22, 23, 24],
['811', '81', 'title8', 22, 23, 24],
['8111', '811', 'title8', 22, 23, 24],
['81111', '8111', 'title8', 22, 23, 24],
['811111', '81111', 'title8', 22, 23, 24],
['8111111', '811111', 'title8', 22, 23, 24],
['81111111', '8111111', 'title8', 22, 23, 24],
['811111111', '81111111', 'title8', 22, 23, 24],
['8111111111', '811111111', 'title8', 22, 23, 24],
['81111111111', '8111111111', 'title8', 22, 23, 24],
['811111111111', '81111111111', 'title8', 22, 23, 24],
['8111111111111', '811111111111', 'title8', 22, 23, 24],
['81111111111111', '8111111111111', 'title8', 22, 23, 24],
['811111111111111', '81111111111111', 'title8', 22, 23, 24],
['8111111111111111', '811111111111111', 'title8', 22, 23, 24],
['81111111111111111', '8111111111111111', 'title8', 22, 23, 24],
['811111111111111111', '81111111111111111', 'title8', 22, 23, 24],
['8111111111111111111', '811111111111111111', 'title8', 22, 23, 24],
['81111111111111111111', '8111111111111111111', 'title8', 22, 23, 24],
['811111111111111111111', '81111111111111111111', 'title8', 22, 23, 24],
['9', '', 'title8', 22, 23, 24],
['91', '9', 'title8', 22, 23, 24],
['911', '91', 'title8', 22, 23, 24],
['9111', '911', 'title8', 22, 23, 24],
['91111', '9111', 'title8', 22, 23, 24],
['911111', '91111', 'title8', 22, 23, 24],
['9111111', '911111', 'title8', 22, 23, 24],
['91111111', '9111111', 'title8', 22, 23, 24],
['911111111', '91111111', 'title8', 22, 23, 24],
['9111111111', '911111111', 'title8', 22, 23, 24],
['91111111111', '9111111111', 'title8', 22, 23, 24],
['911111111111', '91111111111', 'title8', 22, 23, 24],
['9111111111111', '911111111111', 'title8', 22, 23, 24],
['91111111111111', '9111111111111', 'title8', 22, 23, 24],
['911111111111111', '91111111111111', 'title8', 22, 23, 24],
['9111111111111111', '911111111111111', 'title8', 22, 23, 24],
['91111111111111111', '9111111111111111', 'title8', 22, 23, 24],
['911111111111111111', '91111111111111111', 'title8', 22, 23, 24],
['9111111111111111111', '911111111111111111', 'title8', 22, 23, 24],
['91111111111111111111', '9111111111111111111', 'title8', 22, 23, 24],
['911111111111111111111', '91111111111111111111', 'title8', 22, 23, 24],
]

// es6 Class
class ParseArray {
constructor(inputArray) {
this.inputArray = inputArray
this.outputArray = [{
"sub_data": []
}]
this.loopLength = 0
}
loop(pId, items) {
this.inputArray.forEach((item, idx) => {
this.loopLength++
if (item[1] === pId) {
items.push({
main_data: item.slice(2),
sub_data: []
})
delete this.inputArray[idx] // 录入后删掉该条数据 可降低循环次数
this.loop(item[0], items[items.length - 1].sub_data)
}
})
}
}

console.time("es6class")
let val = new ParseArray(array.slice())
val.loop('', val.outputArray[0].sub_data)
// console.log(JSON.stringify(val.outputArray))
console.log('es6class', val.loopLength) // => 26
console.timeEnd("es6class") // => loop: 0.2919921875ms

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

loopLength = 0
outputArray = []
array1 = JSON.parse(JSON.stringify(array))

// forEach
let loop = (pId, items) => {
array1.forEach((item, idx) => {
loopLength++
if (item[1] === pId) {
items.push({
main_data: item.slice(2),
sub_data: []
})
delete array1[idx] // 录入后删掉该条数据 可降低循环次数
loop(item[0], items[items.length - 1].sub_data)
}
})
}

console.time("forEach")
loop('', outputArray)
// console.log(JSON.stringify(outputArray))
console.log('forEach', loopLength) // => 26
console.timeEnd("forEach") // => loop: 0.2919921875ms

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

// es5 prototype
function ParseArray1 () {
this.loopLength = 0
this.outputArray = []
this.array2 = JSON.parse(JSON.stringify(array))
}

ParseArray1.prototype.loop = function(pId, items) { // 注意 箭头表达式的this指向 与function的this指向不一致 function this指向function 箭头表达式this指向函数的上一级
this.array2.forEach((item, idx) => {
this.loopLength++
if (item[1] === pId) {
items.push({
main_data: item.slice(2),
sub_data: []
})
delete this.array2[idx] // 录入后删掉该条数据 可降低循环次数
this.loop(item[0], items[items.length - 1].sub_data)
}
})
}

console.time("es5")

let outputArray666 = new ParseArray1()
outputArray666.loop('', outputArray666.outputArray)
console.log('es5', outputArray666.loopLength) // => 26
console.timeEnd("es5") // => loop: 0.2919921875ms

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

function convert_table_data_with_level(data, parent_node = "") {
var level_1_data = [],
new_data = [];
for (var i = 0, len = data.length; i < len; i++) {
data[i][1] === parent_node ? level_1_data.push(data[i]) : new_data.push(data[i]);
recursionLength++;
}

return level_1_data.map(function(arr) {
parent_node = arr[0];
return {
main_data: arr.splice(2, arr.length - 2),
sub_data: convert_table_data_with_level(new_data, parent_node)
}
});
}

console.time("recursion")
let recursionLength = 0;
let data_with_level = convert_table_data_with_level(array, '')
console.log(JSON.stringify(data_with_level) === JSON.stringify(val.outputArray[0].sub_data))
console.log('recursion', recursionLength) // 42
console.timeEnd("recursion") // => recursion: 0.098876953125ms

// ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

最后编辑于 ：
©著作权归作者所有,转载或内容合作请联系作者
  • 人面猴
    序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
    沈念sama阅读 194,242评论 5赞 459
  • 死咒
    序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
    沈念sama阅读 81,769评论 2赞 371
  • 救了他两次的神仙让他今天三更去死
    文/潘晓璐 我一进店门，熙熙楼的掌柜王于贵愁眉苦脸地迎上来，“玉大人，你说我怎么就摊上这事。” “怎么了？”我有些...
    开封第一讲书人阅读 141,484评论 0赞 319
  • 道士缉凶录：失踪的卖姜人
    文/不坏的土叔 我叫张陵，是天一观的道长。 经常有香客问我，道长，这世上最难降的妖魔是什么？ 我笑而不...
    开封第一讲书人阅读 52,133评论 1赞 263
  • 港岛之恋（遗憾婚礼）
    正文 为了忘掉前任，我火速办了婚礼，结果婚礼上，老公的妹妹穿的比我还像新娘。我一直安慰自己，他们只是感情好，可当我...
    茶点故事阅读 61,007评论 4赞 355
  • 恶毒庶女顶嫁案：这布局不是一般人想出来的
    文/花漫 我一把揭开白布。 她就那样静静地躺着，像睡着了一般。 火红的嫁衣衬着肌肤如雪。 梳的纹丝不乱的头发上，一...
    开封第一讲书人阅读 46,080评论 1赞 272
  • 城市分裂传说
    那天，我揣着相机与录音，去河边找鬼。 笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。 我是一名探鬼主播，决...
    沈念sama阅读 36,496评论 3赞 381
  • 双鸳鸯连环套：你想象不到人心有多黑
    文/苍兰香墨 我猛地睁开眼，长吁一口气：“原来是场噩梦啊……” “哼！你这毒妇竟也来了？” 一声冷哼从身侧响起，我...
    开封第一讲书人阅读 35,190评论 0赞 253
  • 万荣杀人案实录
    序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
    沈念sama阅读 39,464评论 1赞 290
  • 护林员之死
    正文 独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋 以下内容为张勋视角 年9月15日...
    茶点故事阅读 34,549评论 2赞 309
  • 白月光启示录
    正文 我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。 大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
    茶点故事阅读 36,330评论 1赞 326
  • 活死人
    序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
    沈念sama阅读 32,205评论 3赞 312
  • 日本核电站爆炸内幕
    正文 年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
    茶点故事阅读 37,567评论 3赞 298
  • 男人毒药：我在死后第九天来索命
    文/蒙蒙 一、第九天 我趴在偏房一处隐蔽的房顶上张望。 院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
    开封第一讲书人阅读 28,889评论 0赞 17
  • 一桩弑父案，背后竟有这般阴谋
    文/苍兰香墨 我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。 一阵脚步声响...
    开封第一讲书人阅读 30,160评论 1赞 250
  • 情欲美人皮
    我被黑心中介骗来泰国打工， 没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。 一个月前我还...
    沈念sama阅读 41,475评论 2赞 341
  • 代替公主和亲
    正文 我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。 传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
    茶点故事阅读 40,650评论 2赞 335

推荐阅读更多精彩内容