Example event view projection for CouchDB event store.

example-view.json

{
    "_id": "_design/eventProjections",
    "views": {
        "map": "function(doc) {
            if (doc.aggregateType=='contact' &&
                 (doc.event.type=='ContactCreated' ||
                  doc.event.type=='DescriptionChanged') &&
                 doc.event.description) {
                var colon = doc._id.indexOf(':');
                var version = parseInt(doc._id.substr(colon + 1));
                var id = doc._id.substr(0, colon);
                emit(id, {
                    version: version,
                    newDescription: doc.event.description
                });
            }
        }",
        "reduce": "function(key, values, rereduce) {
            var latest = null;
            values.forEach(function(v) {
                if (latest == null || v.version > latest.version) {
                    latest = {
                        version: values[0].version,
                        description: values[0].newDescription
                    };
                }
            });
            return latest;
        }"
    }
}

Why is it values[0] and not v?