Is it Possible to Use Underscore to Create a Javascript Objects with a Variable?

Question

I have the following situation:

var newObject = {user: object, user1: object1}
var user = "something";
var object = {key: [obj, obj], key1: [obj, obj]}

I'd want to add the following to the array of objects in var object:

var addToIt = [objA, objB];

In the end var object should look like:

var object = {key: [obj, obj, objA, objB], key1: [obj, obj]}

I believe there is a way to do it with underscore but until now I've not been able to figure it out. A solution or suggestion would be much appreciated!

In an effort to share my approach, here is something I thought would work but I'm getting an error when I try to push and undefined values for key and key1:

var newHistory = _.mapObject(newObject, function(valN, keyN){
_.mapObject(valN, function(vs, ks){
if(ks = key){
return vs.push(addToIt);
}
})
})

It’s easily possible with object.key=object.key.concat(addToIt); (concat) which makes it a near duplicate of stackoverflow.com/questions/21811184. I’m sure the concat functionality has been covered on StackOverflow before, multiple times. — Sebastian Simon
– Sebastian Simon, Commented Jun 4, 2015 at 7:53
@Mitul, I'd like to underscore as much of it as possible as you can see above. — rashadb
– rashadb, Commented Jun 4, 2015 at 8:30

vignesh · Accepted Answer · 2015-06-04 08:48:48Z

1

Try this way and see whether this one works or not

_.mapObject(newObject, function(valN, keyN){

        var arr=[];
        _.mapObject(valN, function(vs, ks){

               if(ks = "key"){
                 arr.push(vs);
                 arr.push(addToIt)

               }
         });
        return arr;
    })

answered Jun 4, 2015 at 8:48

vignesh

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rashadb · Accepted Answer · 2015-06-04 08:48:30Z

0

Here is the solution I found:

var newHistory = _.mapObject(newObject, function(valN, keyN){
if(keyN == key) {
return valN.concat(addToIt);
} else {
return valN;
}
});

answered Jun 4, 2015 at 8:48

rashadb

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