JavaScript中数组去重的示例分析
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一、前言:
我们在实际工作中,或者在面试找工作时,都会用到或者被问到一个问题,那就是“数组如何去重”。是的,这个问题有很多种解决方案,看看下面的十种方式吧!
二、数组去重方式大汇总:
Methods 1: 思路:定义一个新数组,并存放原数组的第一个元素,然后将元素组一一和新数组的元素对比,若不同则存放在新数组中。
function unique(arr){ var res = [arr[0]]; for(var i=1; iMethods 2:思路:先将原数组排序,在与相邻的进行比较,如果不同则存入新数组。
function unique2(arr){ var arr2 = arr.sort(); var res = [arr2[0]]; for(var i=1; iMethods 3: 利用对象属性存在的特性,如果没有该属性则存入新数组。
function unique3(arr){ var res = []; var obj = {}; for(var i=0; iMethods 4:利用数组的indexOf下标属性来查询。
function unique4(arr){ var res = []; for(var i=0; iMethods 5: 利用数组原型对象上的includes方法。
function unique5(arr){ var res = []; for(var i=0; iMethods 6: 利用数组原型对象上的 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: 利用数组原型对象上的 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: 利用数组原型对象上的 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: 利用数组原型对象上的 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数据结构,它类似于数组,其成员的值都是唯一的 return Array.from(new Set(arr)); // 利用Array.from将Set结构转换成数组 } 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,当我把数组的长度变得很大的时候(如下所示),测试了一下不同方法的执行时间长短,会发现方法三、四、五、六、七相对来说会更有优势,而方法八的执行速度似乎一直垫底。你也可以在你本地跑一下试试!
//测试用的超大数组
var arr = 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//这里只是举例方法三(如果你把所有方法放在一起测试,会更直观的看到执行时间的差异)var time3 = new Date().getTime(); function unique3(arr){ var res = []; var obj = {}; for(var i=0; i以上是“JavaScript中数组去重的示例分析”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注创新互联行业资讯频道!
网页标题:JavaScript中数组去重的示例分析
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