JSFiddle - React, Tailwind, and code Playground

HTML

<div id="result"></div>

JavaScript

var string = ["test_data/new_directory/ok.txt","test_data/reads_1.fq","test_data/test_ref.fa"];
var foldersJSON, foldersArray;
$(string).each(function(){
    console.log(this.split("/"));
    a = this.split("/");
    for (i = 0; i < a.length; i++)
        foldersArray[a[i]] = foldersArray[a[i+1]];
});