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

A solution using underscore:

var finalArray = _.map(members, function(member){
    return _.extend(member, _.omit(_.findWhere(memberInfo, {id: member.userId}), 'id'));
});

1. _.map across the members
2. find the matching member info using _.findWhere
3. _.omit the id key from the matching member info
4. _.extend the member with the member info