从javascript中的对象数组中删除重复值 [英] Remove duplicate values from an array of objects in javascript

问题描述

我有一个像这样的对象数组：

i have an array of objects like this:

arr = [
    {label: Alex, value: Ninja},
    {label: Bill, value: Op},
    {label: Cill, value: iopop}
]

此数组在渲染我的react组件时组成。 i用户 Array.prototype.unshift 用于在数组顶部添加所需元素。
所以我写 arr.unshift（{label：All，value：All}）。当我的组件首次渲染时，我的数组成功创建了我想要的。但是当我重新渲染它时，它会向我显示值为 {label：All，value：All} 的数组。更具体地说，它显示如下：

This array is composed when my react component is rendered. The i user Array.prototype.unshift for adding a desired element in the top of my array. So i write arr.unshift({label: All, value: All}). When my component first rendered my array is successfully created as i desire. But when i rerender it it shows me the array with the value {label: All, value: All} as duplicate. To be more specific it is shown something like this:

arr = [
    {label: All, value: All},
    {label: All, value: All},
    {label: Alex, value: Ninja},
    {label: Bill, value: Op},
    {label: Cill, value: iopop}
]

我该如何解决这个问题？我在这里尝试了特定主题中描述的方法，但它没有用

How can i fix this? I tried the methods described in a specific topic here but it didn't work

推荐答案

你可以使用 array＃reduce 和 array＃some 。

const arr = [
    {label: 'All', value: 'All'},
    {label: 'All', value: 'All'},
    {label: 'Alex', value: 'Ninja'},
    {label: 'Bill', value: 'Op'},
    {label: 'Cill', value: 'iopop'}
]

var result = arr.reduce((unique, o) => {
    if(!unique.some(obj => obj.label === o.label && obj.value === o.value)) {
      unique.push(o);
    }
    return unique;
},[]);
console.log(result);

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