addFolder script only create folder once

I'm making a script that creates a "hero" folder, a "clips" folder and moves the footage into the "clips" folder, and the "clips" folder to the "hero" folder.

My problem is that it creates multiple "hero" folders for footage that has the same name. I need to implement a check if the "hero" folder already exists in my project, I've been trying all day but got nowhere, can someone help out?

var items = app.project.selection;

    for (var i = 0; i < items.length; i++) {
        //create Folder
        var heroName = item.name.split(' ')[0];
        var heroFolder = app.project.items.addFolder(heroName);
        var clipFolder = app.project.items.addFolder(item.name);
        heroFolder.parentFolder = items[i].parentFolder;
        clipFolder.parentFolder = heroFolder;
            //move Source Footage
        items[i].parentFolder = clipFolder; 
}