Converting flat structure to hierarchical

Question

I need to create function which will be able to convert flat object to recursive object. Here is my example: I have flat array:

var flatArray = [
    {
              


        

Answer 1

I tried to write the algorithm in pseudocode, ended up with JS code that almost works (perhaps some additional validations/checks are needed) but shows the general approach to the problem.

//Lets separate children (nodes with a parent) from roots (nodes without a parent)
var children = flatArray.filter(function(object){
    return object.parent !== null;
});

var roots = flatArray.filter(function(object){
    return object.parent === null;
});

//And add each child to the nodes tree
children.foreach(function(child){
    recursiveAdd(roots, child);
});

//To add a children node, node tree is searched recursively for a parent
function recursiveAdd(nodes, child){
    nodes.foreach(function(parent){
        if(parent.guid === child.parent){
            parent.Children = parent.Children | [];
            parent.Children.add(child);
        } else if(parent.Children) {
            recursiveAdd(parent.Children, child);
        }
    });
}

//Temporary children array can be garbage collected
children = null;
//Resulting node tree
var recursiveArray = roots;