数组去重

const array = [
        {
          id: 1,
          name: '张三'
        },
        {
          id: 2,
          name: '李四'
        },
        {
          id: 2,
          name: '王五'
        },
        {
          id: 2,
          name: '赵六'
        }
      ]

eg:根据id去重，只留下第一个重复

* 对象数组根据某个属性去重 ——es6:Map和Set

const res = new Map()
const resultList = array.filter((a) => !res.has(a.id) && res.set(a.id))
console.log('resultList', resultList)

* 对象数组根据某个属性去重 ——reduce

const obj = {}
const resultList = []
array.reduce((pre, cur) => {
  obj[cur.id] ? '' : obj[cur.id] = true && resultList.push(cur)
}, [])
console.log('resultList', resultList)