I needed a script to loop over a calendar-structured folder to generate a list of the most recent updates to a set of projects that are backed up in these folders. I used Frontier. Here's the script.

listChangedProjects.ftsc

on listChangedProjects (whenStart, whenEnd) {
	«Changes
		«1/16/21; 10:36:01 AM by DW
			«Created. Generates a table with the names of the most recent version of each of the projects that
			were edited in the period we're looking at. whenStart is the day we start our search, whenEnd is
			when we stop searching. We go back in time, so whenStart must be more recent than whenEnd. 
	local (basefolder = nodeEditorSuite.getFolder () + "backups:");
	local (destfolder = "Marin:changedProjects:");
	local (when = whenStart,  adrtable = @scratchpad.changedProjects);
	new (tabletype, adrtable);
	while (when > date (whenEnd)) {
		local (subfolder = basefolder + file.getdatepath (":", when));
		if file.exists (subfolder) {
			fileloop (f in subfolder) {
				local (fname = file.filefrompath (f));
				local (projectName = string.nthField (fname, ".", 1));
				if not defined (adrtable^ [projectName]) {
					local (fdest = destfolder + fname);
					adrtable^ [projectName] = f;
					file.surefilepath (fdest);
					file.copy (f, fdest);
					file.setmodified (fdest, file.modified (f))}}};
		when = date.yesterday (when)};
	edit (adrtable);
	file.openfolder (destfolder)};
bundle { //test code
	listChangedProjects (clock.now (), date ("12/21/2020"))}