Copying data from one array to another

Question

I have two arrays as given below.

var obj1 = [
        {
            "POST": "Developer",
            "USERNAME": [
                "User1",
                "User2"
            ]
        },
        {
            "POST": "Tester",
            "USERNAME": [
                "User3"
            ]
        }
    ]

var obj2 = [
        {
            "USERNAME": "User1",
            "USER_PASSWORD": "test1"
        },
        {
            "USERNAME": "User2",
            "USER_PASSWORD": "test2"
        },
        {
            "USERNAME": "User3",
            "USER_PASSWORD": "test3"
        }
    ]

From obj1 I want the POST value to be appended to the appropriate user in obj2.

Final result should look like the below array.

[
    {
        "USERNAME": "User1",
        "USER_PASSWORD": "test1",
        "POST": "Developer"
    },
    {
        "USERNAME": "User2",
        "USER_PASSWORD": "test2",
        "POST": "Developer"
    },
    {
        "USERNAME": "User3",
        "USER_PASSWORD": "test3",
        "POST": "Tester"
    }
]

What have you tried so far? You should post that code and we can try and help you. If you've not tried anything, please go and try something and then come back if you run into any problems. — Andy, Jul 11 '14 at 10:03
possible duplicate of [What is the most efficient way to clone an object?](http://stackoverflow.com/questions/122102/what-is-the-most-efficient-way-to-clone-an-object) — fmsf, Jul 11 '14 at 12:42

score 1 · Accepted Answer · answered Jul 11 '14 at 10:17

Try this:

var obj1 = [
                {"POST":"Developer","USERNAME":["User1","User2"]},
                {"POST":"Tester","USERNAME":["User3"]}
            ];
            var obj2 = [
                {"USERNAME":"User1","USER_PASSWORD":"test1"},
                {"USERNAME":"User2","USER_PASSWORD":"test2"},
                {"USERNAME":"User3","USER_PASSWORD":"test3"}];
            var obj3=[];

            obj1.forEach(function(eachObj1) {
                obj2.forEach(function(eachObj2) {
                    if(eachObj1.USERNAME.indexOf(eachObj2.USERNAME) >= 0) {
                        console.log("in if")
                        eachObj2.POST = eachObj1.POST;
                        obj3.push(eachObj2);
                    }
                });
            });

score -2 · Answer 2 · answered Jul 11 '14 at 10:21

try this,

var obj1 = [{"POST":"Developer","USERNAME":["User1","User2"]},{"POST":"Tester","USERNAME":["User3"]}];
var obj2 = [{"USERNAME":"User1","USER_PASSWORD":"test1"},{"USERNAME":"User2","USER_PASSWORD":"test2"},{"USERNAME":"User3","USER_PASSWORD":"test3"}];
$.each(obj2,function(i,val){
   $.each(obj1,function(index,innerVal){

        var post=innerVal.POST;
        $.each(innerVal.USERNAME,function(i,user){
            if(user==val.USERNAME){
                val.POST=post;
            }
        });
    });
});
alert(JSON.stringify(obj2));

Demo

Since the post is tagged with Node.js it's unlikely that they have jQuery included. And including jQuery just to loop through arrays wouldn't be reasonable. — JJJ, Jul 11 '14 at 11:00

Copying data from one array to another

2 Answers2