Merge two arrays matching an id

Question

I have two arrays like

var members = [{docId: \"1234\", userId: 222}, {docId: \"1235\", userId: 333}];
var memberInfo = [{id: 222, name: \"test1\"}, {id: 333         


        

Answer 1

Do a nested map and update the top level element with the additional field date where fields in the arrays match.

member.map(mem => {
    return memberInfo.map(info => {
        if (info.id === mem.userId) {
            mem.date = info.date;
            return mem;
        }
    }
}