[Javascript] How to choose gray stroke with the script?

I was able to change single pathItem using script, so after few tries I discovered that the conditon for grayColor should be moved out from the second loop to the first one, like this:

for (x=0; x<sourceDoc.pathItems.length; x++) {    
  if (  Math.round(sourceDoc.pathItems[x].strokeColor.gray) == 100 ) { 
    sourceDoc.pathItems[x].strokeColor = sourceDoc.swatches.getByName('Dieline - cut').color; 
     } 
  for (y= 0; y <  cmykColArrLen; y++){ 
    if(Math.round(sourceDoc.pathItems[x].strokeColor.cyan) == // here goes the rest of the code

I don't know why the second loop messed this condition, but it works now. Thank you Carlos for your help.

Hi Carlos,

thank you for your reply. Here is a sample dieline.

If there is a bug in the AI, can the problem be worked around by changing the color space in the Illustrator's color palette before trying to access problematic pathItem?

Hi Mylenium, thanks for answering. There is no magical thinking, I've just posted only a problematic line. Here is the whole loop:

for (x=0; x<sourceDoc.pathItems.length; x++) {
for (y= 0; y < cmykColArrLen; y++){

if(Math.round(sourceDoc.pathItems[x].strokeColor.cyan) == cmykColorArray[y][0] &&
Math.round(sourceDoc.pathItems[x].strokeColor.magenta) == cmykColorArray[y][1] &&
Math.round(sourceDoc.pathItems[x].strokeColor.yellow) == cmykColorArray[y][2] &&
Math.round(sourceDoc.pathItems[x].strokeColor.black) == cmykColorArray[y][3] ) {

if ( Math.round(sourceDoc.pathItems[x].strokeColor.cyan) == cmykColorArray[0][0] && // black defined as CMYK in the array: C = 91,
Math.round(sourceDoc.pathItems[x].strokeColor.magenta) == cmykColorArray[0][1] && // M = 79
Math.round(sourceDoc.pathItems[x].strokeColor.yellow) == cmykColorArray[0][2] && // Y = 62
Math.round(sourceDoc.pathItems[x].strokeColor.black) == cmykColorArray[0][3]) // K = 97

{ sourceDoc.pathItems[x].strokeColor = sourceDoc.swatches.getByName('Dieline - cut').color; // chooses and changes CMYK black strokes to the spot color }

else if ( Math.round(sourceDoc.pathItems[x].strokeColor.gray) == 100) {
sourceDoc.pathItems[x].strokeColor = sourceDoc.swatches.getByName('Dieline - cut').color; // chooses and changes nothing, why? } 

sourceDoc.pathItems[x].strokeWidth = 0.5;
sourceDoc.pathItems[x].strokeOverprint = true;
sourceDoc.pathItems[x].move(dieLyr, ElementPlacement.PLACEATBEGINNING); } } }

This loop compares each pathItem with the array of CMYK colors, if there is a match it changes the stroke color to one of the spot swatches created before that loop. This condition works perfectly when the initial stroke is a CMYK color, but it does nothing when the stroke is a grayColor. I have no idea how to choose those pathItems which are grayColor'ed.