How to update a node or edges property of visjs using angularjs?

[Abhishek Simon]

I have a requirement to hide or unhide some nodes and edges depending on some data. I can achieve it by traversing through visjs's data but that will trigger stabilization everytime one hides or unhides (this overwrite existing data). 

I found this example which adds, updates and removes a node by directly changing nodes value by using add, update & remove
functions. This dynamically does these operations without stabilizing, but when I try the same thing in angularjs it says 

org_nodes.update is not a function

Snippet taken from source of this example

function addNode() {
        var newId = (Math.random() * 1e7).toString(32);
        nodes.add({id:newId, label:"I'm new!"});
        nodeIds.push(newId);
    }


    function changeNode1() {
        var newColor = '#' + Math.floor((Math.random() * 255 * 255 * 255)).toString(16);
        nodes.update([{id:1, color:{background:newColor}}]);
    }


    function removeRandomNode() {
        var randomNodeId = nodeIds[Math.floor(Math.random() * nodeIds.length)];
        nodes.remove({id:randomNodeId});


        var index = nodeIds.indexOf(randomNodeId);
        nodeIds.splice(index,1);
    }

Please help, I am providing a plunker link here, what is it that I am missing here? Using angular-visjs