map function

function(doc) {
  var userID = 500;
  var userTags = [
       100000036,
       100000065,
       100000077,
       100000046,
       100000062,
       100000103
   ];
  if(userID != doc.userID)
  {
    var matchingTags = 0;

    for (i in doc.userTags)
    {
      // Increment matching count for each matching tag
      if(userTags.indexOf(doc.userTags[i]) != -1) matchingTags++;
    }

    emit(doc.userID,matchingTags)  
  }
}