我有一个包含对象数组的对象。
obj = {};
obj.arr = new Array();
obj.arr.push({place:"here",name:"stuff"});
obj.arr.push({place:"there",name:"morestuff"});
obj.arr.push({place:"there",name:"morestuff"});
我想知道从数组中删除重复对象的最佳方法是什么。例如，obj.arr将变成。。。
{place:"here",name:"stuff"},
{place:"there",name:"morestuff"}
当前回答
要从对象数组中删除所有重复项，最简单的方法是使用过滤器：
var uniq＝{}；var arr=[｛“id”：“1”｝，｛“id”：“2”｝；var arrFiltered=arr.filter（obj=>！uniq[obj.id]&&（uniq[obj.id]=true））；console.log（'arrFiltered'，arrFiltered）；
其他回答
为懒惰的Typescript开发人员提供快速（运行时更少）和类型安全的答案：
export const uniqueBy = <T>( uniqueKey: keyof T, objects: T[]): T[] => {
const ids = objects.map(object => object[uniqueKey]);
return objects.filter((object, index) => !ids.includes(object[uniqueKey], index + 1));
}
您也可以使用地图：
const dedupThings = Array.from(things.thing.reduce((m, t) => m.set(t.place, t), new Map()).values());
完整样本：
const things = new Object();
things.thing = new Array();
things.thing.push({place:"here",name:"stuff"});
things.thing.push({place:"there",name:"morestuff"});
things.thing.push({place:"there",name:"morestuff"});
const dedupThings = Array.from(things.thing.reduce((m, t) => m.set(t.place, t), new Map()).values());
console.log(JSON.stringify(dedupThings, null, 4));
结果：
[
{
"place": "here",
"name": "stuff"
},
{
"place": "there",
"name": "morestuff"
}
]
function filterDuplicateQueries(queries){
let uniqueQueries = [];
queries.forEach((l, i)=>{
let alreadyExist = false;
if(uniqueQueries.length>0){
uniqueQueries.forEach((k, j)=>{
if(k.query == l.query){
alreadyExist = true;
}
});
}
if(!alreadyExist){
uniqueQueries.push(l)
}
});
var testArray= ['a','b','c','d','e','b','c','d'];
function removeDuplicatesFromArray(arr){
var obj={};
var uniqueArr=[];
for(var i=0;i<arr.length;i++){
if(!obj.hasOwnProperty(arr[i])){
obj[arr[i]] = arr[i];
uniqueArr.push(arr[i]);
}
}
return uniqueArr;
}
var newArr = removeDuplicatesFromArray(testArray);
console.log(newArr);
Output:- [ 'a', 'b', 'c', 'd', 'e' ]
可以将Object.values（）与Array.prototype.reduce（）结合使用：
const things=新对象（）；things.thing=新数组（）；thing.thing.push（{place:“here”，name:“stuff”}）；things.thing.push（{place:“there”，name:“morestuff”}）；things.thing.push（{place:“there”，name:“morestuff”}）；constresult=Object.values（things.thing.reduce（（a，c）=>（a[`${c.place}${c.name}`]=c，a），{}））；console.log（结果）；.作为控制台包装｛最大高度：100%！重要；顶部：0；｝
