Remove folders in array

Question

Hello everyone,
I am currently troubleshooting the piece of code below. When I run this script, the second while loop is causing the script to break.
The first while loop figures out which items in my project is folderItems and put those in an array but it makes sure not to put folder called "Cleaning" in there by identifying it by its ID.
The second while loop runs through once and let's me, accurately, know how many folders is about to be deleted. It then deletes the first folder in the array, then gets rid of the first element in the array so the lenght of the array shrinks. The second time through the while loop, it again lets me know how many items remain to be deleted and then it breaks on "removeFolders[0].remove();".
Any ideas whats going on?
Cheers!
var j = 1;
var removeFolders = new Array();
while (j <= app.project.numItems) {
    //alert(app.project.numItems);
    if(app.project.item(j) instanceof FolderItem && app.project.item(j).id != cleaning.id) removeFolders.push(app.project.item(j));
    //if(app.project.item(j) instanceof FolderItem && app.project.item(j) != cleaning.id) removeFolders.push(app.project.item(j));
    ++j;
while (removeFolders.length != 0){
        alert("How many folders to be removed: " + removeFolders.length);
        removeFolders[0].remove();
        removeFolders.splice (0, 1);

Answer 1

Hello,
i just tried your code with a dummy project (10 folders with various names, some comps with some solids), got no error, it deleted all folders except the one called 'cleaning'.
What is your error message when the script breaks ?
You can try deleting last to first, it might change something although it's not clear why it would, it's essentially the same:
while (removeFolders.length)
    alert("How many folders to be removed: " + removeFolders.length);
    removeFolders.pop().remove();
Xavier