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; iMethods 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; iMethods 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; iMethods 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; iMethods 5: 利用數(shù)組原型對象上的includes方法。
function unique5(arr){ var res = []; for(var i=0; iMethods 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; iMethods 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
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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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