chrisvaughn

//count dups in mongo with mapReduce
m = function() { emit(this.user_id, 1); };
r = function (k, vals) { return Array.sum(vals); };
res = db.tasks.mapReduce(m, r, { out : {replace : "results", db : "mr"}});

// more difficult 
function map() {
    var sorted = this._keywords.sort();
    key = sorted.join(" ");
    var ret = {title : this.title, id : this._id, total: 1};