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js中数组对象去重的方法
阅读量:359 次
发布时间:2019-03-04

本文共 1357 字,大约阅读时间需要 4 分钟。

方法一:对象访问属性法

通过遍历数组,检查对象中是否存在对应的键值。如果不存在,则将该对象添加到结果数组中。

var arr = [{key: '01', value: '乐乐'}, {key: '02', value: '博博'}, {key: '03', value: '淘淘'}, {key: '04', value: '哈哈'}, {key: '01', value: '乐乐'}];        var result = [];        var obj = {};        for (var i = 0; i < arr.length; i++) {          var key = arr[i].key;          if (!obj.hasOwnProperty(key)) {            obj[key] = arr[i];            result.push(obj[key]);          }        }

方法二:数组reduce方法

利用数组的reduce方法,逐一处理数组中的每个对象,检查对象中是否存在对应的键值。如果不存在,则将该对象添加到结果数组中。

var arr = [{key: '01', value: '乐乐'}, {key: '02', value: '博博'}, {key: '03', value: '淘淘'}, {key: '04', value: '哈哈'}, {key: '01', value: '乐乐'}];        var result = arr.reduce(function (acc, current) {          var key = current.key;          if (!acc.hasOwnProperty(key)) {            acc[key] = current;            return acc;          } else {            return acc;          }        }, {});

方法三:ES6 Set去重

通过遍历数组,使用ES6 Set数据结构记录已存在的键值,逐一过滤出唯一的对象数组。

let arr = [{id: 1, name: 'm'}, {id: 2, name: 'mu'}, {id: 4, name: 'muz'}, {id: 2, name: 'muzi'}];        let idSet = new Set();        let newArr = arr.filter(function (obj) {          const existingId = idSet.has(obj.id);          idSet.add(obj.id);          return !existingId;        });        console.log(newArr); // [{id: 1, name: 'm'}, {id: 2, name: 'mu'}, {id: 4, name: 'muz'}]

转载地址:http://oetr.baihongyu.com/

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