js的map和reduce方法之对象数组去重

Posted 2020-12-20 Eddina

map方法 
　　

let objArr = [{name: ‘xue‘,age: 24},{name: ‘xue‘,age: 25},{name:‘qing‘}]

const res = new Map();

objArr = objArr.filter((arr) => !res.has(arr.name) && res.set(arr.name, 1))

reduce方法

let obj = {}

let objArr = [{name: ‘xue‘,age: 24},{name: ‘xue‘,age: 25},{name:‘qing‘}]

objArr = objArr.reduce((prev, item) => {
　　if(!obj[item.name]){

　　prev.push(item)

　　obj[item.name] = true

}

return prev
}, [])