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成都創(chuàng)新互聯(lián)網(wǎng)站制作重慶分公司

JavaScript中數(shù)組去重的示例分析

這篇文章主要為大家展示了“JavaScript中數(shù)組去重的示例分析”,內(nèi)容簡而易懂,條理清晰,希望能夠幫助大家解決疑惑,下面讓小編帶領(lǐng)大家一起研究并學(xué)習(xí)一下“JavaScript中數(shù)組去重的示例分析”這篇文章吧。

創(chuàng)新互聯(lián)主要企業(yè)基礎(chǔ)官網(wǎng)建設(shè),電商平臺(tái)建設(shè),移動(dòng)手機(jī)平臺(tái),成都微信小程序等一系列專為中小企業(yè)按需定制制作產(chǎn)品體系;應(yīng)對中小企業(yè)在互聯(lián)網(wǎng)運(yùn)營的各種問題,為中小企業(yè)在互聯(lián)網(wǎng)的運(yùn)營中保駕護(hù)航。

一、前言:

我們在實(shí)際工作中,或者在面試找工作時(shí),都會(huì)用到或者被問到一個(gè)問題,那就是“數(shù)組如何去重”。是的,這個(gè)問題有很多種解決方案,看看下面的十種方式吧!

二、數(shù)組去重方式大匯總:

Methods 1: 思路:定義一個(gè)新數(shù)組,并存放原數(shù)組的第一個(gè)元素,然后將元素組一一和新數(shù)組的元素對比,若不同則存放在新數(shù)組中。

function unique(arr){
 var res = [arr[0]];
 for(var i=1; i

Methods 2:思路:先將原數(shù)組排序,在與相鄰的進(jìn)行比較,如果不同則存入新數(shù)組。

function unique2(arr){
 var arr2 = arr.sort();
 var res = [arr2[0]];
 for(var i=1; i

Methods 3: 利用對象屬性存在的特性,如果沒有該屬性則存入新數(shù)組。

function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i

Methods 4:利用數(shù)組的indexOf下標(biāo)屬性來查詢。

function unique4(arr){
 var res = [];
 for(var i=0; i

Methods 5: 利用數(shù)組原型對象上的includes方法。

function unique5(arr){
 var res = [];
 
 for(var i=0; i

Methods 6: 利用數(shù)組原型對象上的 filter 和 includes方法。

function unique6(arr){
 var res = [];
 
 res = arr.filter(function(item){
  return res.includes(item) ? '' : res.push(item);
 });
 return res;
}

console.log('------------方法六---------------');

console.log(unique6([1,1,2,3,5,3,1,5,6,7,4]));

Methods 7: 利用數(shù)組原型對象上的 forEach 和 includes方法。

function unique7(arr){
 var res = [];
 
 arr.forEach(function(item){
  res.includes(item) ? '' : res.push(item);
 }); 
 return res;
}

console.log('------------方法七---------------');

console.log(unique7([1,1,2,3,5,3,1,5,6,7,4]));

Methods 8: 利用數(shù)組原型對象上的 splice 方法。

function unique8(arr){
 var i,
  j,
  len = arr.length; 
 for(i = 0; i < len; i++){
  for(j = i + 1; j < len; j++){
   if(arr[i] == arr[j]){
    arr.splice(j,1);
    len--;
    j--;
   }
  }
 }
 return arr;
}

console.log('------------方法八---------------');

console.log(unique8([1,1,2,3,5,3,1,5,6,7,4]));

Methods 9: 利用數(shù)組原型對象上的 lastIndexOf 方法。

function unique9(arr){
 var res = []; 
 for(var i=0; i

Methods 10: 利用 ES6的set 方法。

function unique10(arr){
 //Set數(shù)據(jù)結(jié)構(gòu),它類似于數(shù)組,其成員的值都是唯一的
 return Array.from(new Set(arr)); // 利用Array.from將Set結(jié)構(gòu)轉(zhuǎn)換成數(shù)組
}

console.log('------------方法十---------------');

console.log(unique10([1,1,2,3,5,3,1,5,6,7,4]));

 三、其他:

有意思的是,當(dāng)我把數(shù)組的長度變得很大的時(shí)候(如下所示),測試了一下不同方法的執(zhí)行時(shí)間長短,會(huì)發(fā)現(xiàn)方法三、四、五、六、七相對來說會(huì)更有優(yōu)勢,而方法八的執(zhí)行速度似乎一直墊底。你也可以在你本地跑一下試試!

//測試用的超大數(shù)組
var arr = 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//這里只是舉例方法三(如果你把所有方法放在一起測試,會(huì)更直觀的看到執(zhí)行時(shí)間的差異)

var time3 = new Date().getTime();
function unique3(arr){
 var res = [];
 var obj = {};
 for(var i=0; i

以上是“JavaScript中數(shù)組去重的示例分析”這篇文章的所有內(nèi)容,感謝各位的閱讀!相信大家都有了一定的了解,希望分享的內(nèi)容對大家有所幫助,如果還想學(xué)習(xí)更多知識,歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道!


新聞標(biāo)題:JavaScript中數(shù)組去重的示例分析
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