In diesem Code habe ich einen Arzt Dokument und in dem Dokument gibt es eine Reihe von Patienten des Arztes. In diesem Fall möchte ich herausfinden, das Durchschnittsalter aller Patienten in meinem Array.Wie könnte ich das tun?Wie kann ich den Durchschnittswert eines Werts in einem Array ermitteln?
{
"_id" : ObjectId("57113238bde91693e9ff69e7"),
"docname" : "Arthur Hovsepyan",
"job_desc" : "Hepatologist",
"sex" : "male",
"jobtype" : "fulltime",
"office" : "room 448",
"email" : "[email protected]",
"phone_number" : 862124343,
"address" : "68 Peterburg street,waterford",
"hours" : 12,
"patients" : [
{
"name" : "Jenny Power",
"ward_no" : 1,
"sex" : "female",
"termdays" : 2,
"illness_type" : "minor",
"age" : 22,
"phone_number" : 877285221,
"address" : "63 Johnston street ,Waterford"
},
{
"name" : "Marie Peters",
"ward_no" : 2,
"sex" : "female",
"termdays" : 0,
"illness_type" : "minor",
"age" : 21,
"phone_number" : 862145992,
"address" : "99 Grange,Waterford"
},
{
"name" : "Philip John",
"ward_no" : 2,
"sex" : "male",
"termdays" : 10,
"illness_type" : "serious",
"age" : 31,
"phone_number" : 861125981,
"address" : "12 Monvoy Bridge,Waterford"
},
{
"name" : "Marta Peters",
"ward_no" : 3,
"sex" : "female",
"termd7ays" : 0,
"illness_type" : "minor",
"age" : 31,
"phone_number" : 862125981,
"address" : "100 Grange Manor,Waterford"
}
]
}
, wenn ich versuche, dass ich einen Durchschnitt von Null erhalten – ebatinstitute