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MAP
===
Date.prototype.setRFC3339 = function(dString){
var regexp = /(\d\d\d\d)(-)?(\d\d)(-)?(\d\d)(T)?(\d\d)(:)?(\d\d)(:)?(\d\d)(\.\d+)?(Z|([+-])(\d\d)(:)?(\d\d))/;

if (dString.toString().match(new RegExp(regexp))) {
var d = dString.match(new RegExp(regexp));
var offset = 0;

this.setUTCDate(1);
this.setUTCFullYear(parseInt(d[1],10));
this.setUTCMonth(parseInt(d[3],10) - 1);
this.setUTCDate(parseInt(d[5],10));
this.setUTCHours(parseInt(d[7],10));
this.setUTCMinutes(parseInt(d[9],10));
this.setUTCSeconds(parseInt(d[11],10));
if (d[12])
this.setUTCMilliseconds(parseFloat(d[12]) * 1000);
else
this.setUTCMilliseconds(0);
if (d[13] != 'Z') {
offset = (d[15] * 60) + parseInt(d[17],10);
offset *= ((d[14] == '-') ? -1 : 1);
this.setTime(this.getTime() - offset * 60 * 1000);
}
} else {
this.setTime(Date.parse(dString));
}
return this;
};
function(doc) {
if (doc.doc_type=="EdoPing" && doc.em_type==0) {
date = new Date().setRFC3339(doc.created_at);
var key = doc.em_uname + String(doc.created_at).substring(0,10);
emit([doc.created_at.substring(0,10) ] , [doc.em_uname, 1] );
}
}

REDUCE
======
function(keys, values, rereduce) {

var ucount = 0;
var seen = new Object();
if (!rereduce) {
// This is the reduce phase, we are reducing over emitted values from
// the map functions.

// we count 1 if a given uname has not been seen

for(var i in values) {
if (seen[values[i][0]] == undefined) {
seen[values[i][0]] = 1;
ucount += 1;
}
}
}
else {
// This is the rereduce phase, we are re-reducing previosuly
// reduced values.
for(var i in values) {
// loop around seen object values
for(var j in values[i][1]) {
if (seen[j] == undefined) {
seen[j] = 1;
ucount += 1;
}
}
}
}
return [ucount, seen];
}
==========

["2010-03-03"] [1, {student1: 1}]
["2010-03-04"] [1, {student1: 1}]
["2010-03-05"] [1, {eong: 1}]
["2010-03-06"] [3, {jfrancillette: 1, bkante: 1, mlouviers: 1}]
["2010-03-07"] [1, {student1: 1}]