create object within object Javascript

Question

My Code :

for( var i in zones) {
                    var latlons1 = new google.maps.LatLng(zones[i].b.cen_x, zones[i].b.cen_y);
                    var latlons2 = new google.maps.LatLng(zones[i].b.max_x, zones[i].b.max_y);
                    var latlons3 = new google.maps.LatLng(zones[i].b.min_x, zones[i].b.min_y);

                     obj1 = { zones[i].n = {1:latlons1,2:latlons2,3:latlons3}  } //here object creation

                    console.log(obj1);

                }

what i am doing wrong? consol log error shows at object create.

thanks for answer, please show me how to use object at this moment Properly — Dest
– Dest, Commented Oct 23, 2012 at 12:01
If you are using numbers as index, why are you not using an array to start? — epascarello
– epascarello, Commented Oct 23, 2012 at 12:30

Anthony Grist · Accepted Answer · 2012-10-23 12:07:47Z

6

When creating an object literal in JavaScript the key and value are separated by a colon (:). Also note that if you want to use dynamic keys then you'll need to use the square bracket notation for setting and accessing those properties. So this:

obj1 = { zones[i].n = {1:latlons1,2:latlons2,3:latlons3}  }

should become:

obj1 = {};
obj1[zones[i].n] = {
    1: latlons1,
    2: latlons2,
    3: latlons3
};

If you're confused as to why you have to do it this way it's because the keys aren't evaluated. While you meant that the key should be the value that's referenced by zones[i].n, JavaScript interprets it as the key should be the string literal "zones[i].n", which obviously isn't what you want.

edited Oct 23, 2012 at 12:07

answered Oct 23, 2012 at 12:02

Anthony Grist

38.4k8 gold badges64 silver badges76 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

user235273 Over a year ago

Yes, in that case zones[i].n will be the top level key which contains an object with three props.

user3299442 · Accepted Answer · 2014-04-08 11:58:13Z

0

To use an object within an object,

    //An object within an object
    var NestedObject=new Object();
    NestedObject.one={
    sad:{
    d:"Add"
    }
    }

I solved this using experimental coding within Codecademy.com; Thanks for letting me share my answer!

answered Apr 8, 2014 at 11:58

user3299442

1

Collectives™ on Stack Overflow

create object within object Javascript

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related