JS數組問題
2022-05-11 11:03:46

1. 判斷對象數組是否包含某個屬性

let objArr=[{type:1},{type:2}]
let isExist=objArr.some(item=>item.type==1)

2. 判斷對象數組是否包含重復屬性

let objArr=[{type:1},{type:2},{type:3}]
let objArrTypeList = objArr.map((item) => item.type);
for (let index in objArr){
  let item=objArr[index]
  if (objArrTypeList.indexOf(item.type) !== Number(index)){
    console.log(`重復項索引${Number(index) + 1}`)
  }
}

3. 數組交集

arr1.filter((item) => arr2.includes(item))

4. 數組差集

arr1.filter((item) => !arr2.includes(item))