Need help with multiple -if else- while looping through script

This example script will take a directory of input files and run the UnSharpMask filter with a range (start/end or "edge"/step) for amount, radius and threshold.

I'm trying to figure out how to have multiple "if else" statements change data in an Array while looping through the script. Say I already have a set ballpark minimum and maximum from some combinations of amount, radius and threshold that I want hold to. I get the idea of what I am trying to do, but when I attempt to put it into practice I am doing probably doing something very simple incorrect. Script below with question in bold red:

#target photoshop

function SaveTIFF(saveFile){ 

tiffSaveOptions = new TiffSaveOptions();  

tiffSaveOptions.embedColorProfile = true;  

tiffSaveOptions.alphaChannels = true;  

tiffSaveOptions.layers = true; 

tiffSaveOptions.imageCompression = TIFFEncoding.TIFFLZW;  

activeDocument.saveAs(saveFile, tiffSaveOptions, true, Extension.LOWERCASE);  

}; 

function range(start, edge, step) {

  if (arguments.length == 01) {

    edge = start;

    start = 00;

  }

  edge = edge || 00;

  step = step || 01;

  for (var ret = []; (edge - start) * step > 00; start += step) {

    ret.push(start);

  }

  return ret;

}

function main() {

    var Base = Folder.selectDialog("Select directory to process");

    var BaseFiles = Base.getFiles("*.psd");

    var errorlog = File(Base + "/Test_Log.txt");

    var d =new Date;

    errorlog.open('a');

    errorlog.writeln(d);

    for (var x = 0 ;x < BaseFiles.length; x++) {

            var doc1 = app.open(BaseFiles[x]);

            app.activeDocument = doc1;

    var filter = "UnSharpMask";

        amount = range (50, 501, 50);

        radius = range (0, 61, 20);

        threshold = range (0, 256, 60);

    for (var i = 0; i < amount.length; i ++) {

    for (var j = 0; j < radius.length; j ++) {

    for (var k = 0; k < threshold.length; k ++) {

// if (amount >200){ I want to be able either change the entire radius start/edge/step range or just change the radius start = 10; and then say Threshold start = 60;}

// else if (amount <200 && amount >100) change radius and threshold

// else if (amount <100) change radius and threshold

activeDocument.activeLayer.applyUnSharpMask(amount[i],radius[j],threshold[k]);

    var doc = BaseFiles[x];

    var Path = File(Folder.desktop);

    var Name = doc.name.replace(/\.[^\.]+$/, '');

    var saveFile = File(Path + "/UnSharpMask/" + Name + "_" + filter + "_amount" + amount[i] + "_radius" + radius[j] +"_threshold" + threshold[k] + ".tif");

    SaveTIFF(saveFile);

    app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

    app.open(BaseFiles[x]);

    }

  }

}

        while (documents.length > 0) {

        activeDocument.close(SaveOptions.DONOTSAVECHANGES);

           }

     }

}

main();