Illustrator: Rename Swatches

In Illustrator Javascript, you can use the following to rename layers:

var doc = app.activeDocument;

// loop through all layers

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

//Set up variables for current and new name

          var currentName = "Unused";

          var newName = "-Unused";

//Set up Variable to access layer name

          var currentLayer = app.activeDocument.layers[i];

          if (currentLayer.name == currentName) {

                    currentLayer.name = newName;

          }

}

Is there anyway to rename colour swatches.

For example, I have 20 swatches named Yellow -(Keyword). (The keyword is different for each swatch).

I would like to replace yellow with the word colour1 while replacing the -(keyword) part in tact.

Is this possible? My swatches are in groups, so I am not sure if it makes it more complicated.

Thanks!