CouchDB_MapReduce_Functions.md

Happiness

Map

function (doc) {
  emit(doc.code, doc.sentiment);
}

Reduce

function (keys, values, rereduce) {
  var analysis = { count: 0, polarity: 0 };
  if (rereduce){
        for(var i=0; i < values.length; i++) {
            analysis.count += values[i].count;
            analysis.polarity += values[i].polarity;
        }
        analysis.polarity = analysis.polarity / analysis.count;
        return analysis;
  }

  analysis.count = values.length;
  analysis.polarity = sum(values);
  return analysis;
}