如何基于每个对象的字符串属性数组对数组中的对象进行深层比较/匹配?

时间:2019-10-28 05:14:14

标签: javascript lodash

带有对象的数组:

var myArr = [ { user: 'jane', properties: ['prop1', 'prop2'] }
              { user: 'bob', properties: ['prop1', 'prop4'] }
              { user: 'dave', properties: ['prop1', 'prop2', 'prop3'] }
              { user: 'tim', properties: ['prop4', 'prop2', 'prop3'] } 
];

在纯JavaScript中是否存在一种方法,或者可能使用lodash获取具有至少一个共同属性的用户?输出应指示哪个用户与哪个用户匹配,没有重复。

我已经尝试了很多方法,但不幸的是无法获得所需的输出。

2 个答案:

答案 0 :(得分:2)

以下解决方案使用Set来确定是否存在匹配的属性,并结合reduce()操作以输出匹配的用户对:

const array = [{ user: 'jane', properties: ['prop1', 'prop2'] },
  { user: 'bob', properties: ['prop1', 'prop4'] },
  { user: 'dave', properties: ['prop1', 'prop2', 'prop3'] },
  { user: 'tim', properties: ['prop4', 'prop2', 'prop3'] }];
  
const result = array.reduce((acc, val1, i, arr) => [
  ...acc,
  ...arr.slice(i + 1).filter(val2 => {
    const properties = [...val1.properties, ...val2.properties];
    return new Set(properties).size < properties.length;
  }).map(val2 => [val1.user, val2.user])
], []);

console.log(result);

答案 1 :(得分:0)

您可以使用Map和Object,计算每个属性的用户出现次数,如果它与数组的长度相同,则所有用户中至少存在一个属性

let matcher = (arr) => {
  let mapper = {}
  arr.forEach(v => {
  let { user, properties } = v
    properties.forEach(v => {
      if (mapper[v]) {
        mapper[v].set(user, (mapper[v].get(user) || 0) + 1)
      } else {
        mapper[v] = new Map()
        mapper[v].set(user, 1)
      }
    })
  })
  return Object.entries(mapper).some(([_, v]) => {
    let total = [...v].reduce((a, [_, b]) => a + b, 0)
    return total === arr.length
  })
}

let arr = [{user: 'jane',properties: ['prop1', 'prop2']}, {user: 'bob',properties: ['prop1', 'prop4']}, {user: 'dave',properties: ['prop1', 'prop2', 'prop3']}, {user: 'tim',properties: ['prop4', 'prop2', 'prop3']}];

console.log(matcher(arr))

let arr2 = [{user: 'jane',properties: ['prop1', 'prop2']},{user: 'bob',properties: ['prop1', 'prop4']}]

console.log(matcher(arr2))