I'm making an online game where users have different ID's.
Here's the client code for creating a new player:
var newPlayer = function(id){
return player[player.length]={
x:0,
y:0,
id:id
}
}
newPlayer(50) would create a player with the ID 50.
How do I select that player based on its id variable?
Thanks
The storage of a JavaScript array can be sparse so you can just do the following:
function newPlayer(id) {
return player[id] = { x:0, y: 0, id: id };
}
function findPlayer(id) {
return player[id];
}
This results in a at worst, O(log N), but probably close to O(1), lookup at the cost of potentially more storage.
Chuck.
Create a function, iterate the array, return once found
function findPlayer(id) {
for (var i = 0; i < player.length; i++) {
if (player[i].id == id) return player[i];
}
}
var player = [];
newPlayer(123);
newPlayer(234);
Using Underscore or Lodash (or vanilla JS, if you prefer):
var player123 = _.findWhere(players, { id: 123 });
Etc.
If you will only ever search by id, and id is unique among all players, you could store the players in a key-value object instead of an array:
function newPlayer(id) {
player[id] = { x: 0, id: id }
}
Lookup via:
var player123 = player[123];
