How to get character left and rigth from insertionpoint [js-CS6]?

couldn't moved further this:

var aa = app.selection[0].insertionpoints[0].words[0];

can't ideas, how use in line command "charat"...

index = app.selection[0].insertionpoints[0].index;

charleftofcursor = app.selection[0].parentstory.characters[index-1];

charrightofcursor = app.selection[0].parentstory.characters[index];

 

peter

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