json数据转换

Question

[{endDateTime: "19:59"
expectValue: 100
startAtTime: "19:58"},{endDateTime: "19:59"
expectValue: 200
startAtTime: "20:58"}]

json数据如何转换成下面的数据格式

{19:58,19:59: "100", 19:59,20:58: "200"}

Answer 1

arr.reduce((result,v)=>{
    result[v.startAtTime+","+v.endDateTime]=v.expectValue;
    return result;
},{})