emit to specifics sockets (like a whisper) which contain specific socket.name - node.js

Question

I have my sockets stored like this in an object "people" . but now I would like to extract coincidences in people.name with an object like ["4323","9","43535"] for example 9. meaning extract in this case "OGyF_FMFbsr0ldcbAAAK" socket.
In a few words navigate through ["4323","9","43535"] and find if they are in people , so then emit a notification to the socket which contain people.name === 9 . Could be more than one socket.
So.
for each "attending"
["4323","9","43535"]
in "people"
{
"ZA-CJOc1PtiwDVxkAAAD":
{"name":"4","owns":"2-0-62","inroom":"2-0-62","device":"desktop"},
"wKg2rcFSHgcl4m3WAAAG":
{"name":"3","owns":"2-0-110","inroom":"2-0-110","device":"desktop"},
"OGyF_FMFbsr0ldcbAAAK":
{"name":"9","owns":null,"inroom":null,"device":"desktop"}
}
then emit
io.sockets.socket(id).emit("notification", result);
QUESTIONS:
How do I make the right code to select sockets to send notification?
How then would emit the notification for each one?
thanks in advance

Answer 1

If I understand what you're asking correctly, then one way to do this is to iterate over the keys of your people object, compare the name properties of each of them with the elements in your attending array, and push any matching keys into a new array found to get a list of people whose name is found in your attending list.
You can then iterate over the found array to emit messages to clients in your people object that match your search criteria.
var attending = ['4323', '9', '43535'],
found = [];
var people = {
'ZA-CJOc1PtiwDVxkAAAD': {
'name': '4', 'owns': '2-0-62', 'inroom': '2-0-62', 'device': 'desktop'
},
'wKg2rcFSHgcl4m3WAAAG': {
'name': '3', 'owns': '2-0-110', 'inroom': '2-0-110', 'device': 'desktop'
},
'OGyF_FMFbsr0ldcbAAAK': {
'name': '9', 'owns': null, 'inroom': null, 'device': 'desktop'
}
};
for (var person in people) {
for (var i = 0, numAttending = attending.length; i < numAttending; i++) {
if (people[person].name === attending[i]) {
found.push(person);
}
}
}
for (var i = 0, numFound = found.length; i < numFound; i++) {
io.sockets.socket(found[i]).emit('notification', result);
};
Edit
If you want to push whole objects onto your found array, you could do it like this. Since the entire object and not only the client id is being stored in the array, the emit loop below needs some slight adjusting to keep working.
for (var person in people) {
for (var i = 0, numAttending = attending.length; i < numAttending; i++) {
if (people[person].name === attending[i]) {
found.push(people[person]);
//this would give something like this, without the socket id
//[{"name":"3","owns":null,"inroom":null,"device":"desktop"}]
}
}
}
for (var person in found) {
io.sockets.socket(person).emit('notification', result);
};