在对象数组中搜索对象

Question

我有以下数组：

const HEROES = [
{ id: 1, name: 'Captain America', squad: 'Avengers' },
{ id: 2, name: 'Iron Man', squad: 'Avengers' },
{ id: 3, name: 'Spiderman', squad: 'Avengers' },
{ id: 4, name: 'Superman', squad: 'Justice League' },
{ id: 5, name: 'Wonder Woman', squad: 'Justice League' },
{ id: 6, name: 'Aquaman', squad: 'Justice League' },
{ id: 7, name: 'Hulk', squad: 'Avengers' },
];

我正在尝试将另一个对象{ id: 5，the：'Justice‘}传递到数组中以查找匹配的对象。

例如：

findOne(HEROES, { id: 5, squad: 'Justice League' }) 

应该返回

{ id: 5, name: 'Wonder Woman', squad: 'Justice League' }

我不知道如何开始，任何帮助都将不胜感激。

Answer 1

使用find

​

const HEROES = [
{ id: 1, name: 'Captain America', squad: 'Avengers' },
{ id: 2, name: 'Iron Man', squad: 'Avengers' },
{ id: 3, name: 'Spiderman', squad: 'Avengers' },
{ id: 4, name: 'Superman', squad: 'Justice League' },
{ id: 5, name: 'Wonder Woman', squad: 'Justice League' },
{ id: 6, name: 'Aquaman', squad: 'Justice League' },
{ id: 7, name: 'Hulk', squad: 'Avengers' },
];

const findOne = (arr, query) => {
  const { id, squad } = query;
  return arr.find(({ id: a, squad: b }) => (id != undefined ? a == id : true) && (b != undefined ? b == squad : true));
};

console.log(findOne(HEROES, { id: 5, squad: "Justice League" }));

​

Answer 2

看看下划线JS或Lodash这样的实用程序库。他们就有这样的功能。

来自lodash文档：

var users = [
  { 'user': 'barney',  'age': 36, 'active': true },
  { 'user': 'fred',    'age': 40, 'active': false },
  { 'user': 'pebbles', 'age': 1,  'active': true }
];

_.find(users, function(o) { return o.age < 40; });
// => object for 'barney'

// The `_.matches` iteratee shorthand.
_.find(users, { 'age': 1, 'active': true });
// => object for 'pebbles'

Answer 3

使用find的相似代码

​

const HEROES = [
{ id: 1, name: 'Captain America', squad: 'Avengers' },
{ id: 2, name: 'Iron Man', squad: 'Avengers' },
{ id: 3, name: 'Spiderman', squad: 'Avengers' },
{ id: 4, name: 'Superman', squad: 'Justice League' },
{ id: 5, name: 'Wonder Woman', squad: 'Justice League' },
{ id: 6, name: 'Aquaman', squad: 'Justice League' },
{ id: 7, name: 'Hulk', squad: 'Avengers' },
];

const findOne=(arr,obj)=>arr.find(x=>x.id==obj.id&&x.squad==obj.squad);

console.log(findOne(HEROES, { id: 7, squad: 'Avengers' }));

​