Question

I’m trying to create a List Object in jquery, I’m using the following code but it’s not working, I found this example so I wrote a similar thing.

function Node(left, right, content)
{
    this.left = left;
    this.right = right;
    this.content = content;
}

var n1 = new Node('', n2, 'content content content');    
var n2 = new Node(n1, n2, 'content content content');
var n3 = new Node(n2, '', 'content content content');

console.log(box2);

Now, if i call n1.right it return undefined.
can help me please.

Answer 1

You are passing n2 to new Node before it has a value, hence it’s undefined. You cannot pass the node to another node before it exists.

An easy fix would be to “link” the nodes after you created them:

function Node(content, left, right)
{
    this.left = left;
    this.right = right;
    this.content = content;
}

var n1 = new Node('content content content');    
var n2 = new Node('content content content');
var n3 = new Node('content content content');

n1.right = n2;
n2.left = n1;
n2.right = n3;
n3.left = n2;

Though you’d probably want some getter and setter methods to properly handle insertions of new nodes into the list.

Learn more about how objects work: MDN – Woking with objects.

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This could be an XY problem though, in which case you’d have to explain what problem you are actually trying to solve. If you just want to create a list of objects, you can use an array ^[MDN].