javascript: push to multi dimensional array (name associated)

Question

i want to create a array:

myarray:array [
 "test1" = [
    [0] = 
     {
      name: "mike",
      friend: "tom"
     }
    ]
 ]
 "test2": [
    [0] = 
     {
      name: "mike",
      friend: "tom"
     }
    ],
    [1] = 
     {
      name: "mike",
      friend: "tom"
     }
    ]
 ]
]

how i can dynamically add Objects?

In php i would do something like that:

$content = {name: "robert", friend: "mike"}
$myarray[$group][] = $content; // Group is the dynamic element

in Javascript i try this:

myarray[group].push({
 name: "mike", friend: "-"
})
// group is the dynamic element

but he failed with Cannot call method 'push' of undefined on the first call.

I don't know how many "groups" there are so i cannot init the array with all the group.

What is the value of group? Where you want to push?

Satpal
– Satpal

2014-04-08 08:51:52 +00:00
Commented Apr 8, 2014 at 8:51 — Satpal
– Satpal, Commented Apr 8, 2014 at 8:51
Your array declaration is not valid.

Mosho
– Mosho

2014-04-08 08:54:39 +00:00
Commented Apr 8, 2014 at 8:54 — Mosho
– Mosho, Commented Apr 8, 2014 at 8:54
@Mosho: Oh right thank you - i corrected

mdunisch
– mdunisch

2014-04-08 09:00:47 +00:00
Commented Apr 8, 2014 at 9:00 — mdunisch
– mdunisch, Commented Apr 8, 2014 at 9:00

xdazz · Accepted Answer · 2014-04-08 08:55:32Z

2

Use object instead array to hold the information:

Example:

function addUser(users, user, group) {
  if (!users[group]) {
     users[group] = [];
  }
  users[group].push(user);
  return users;
}

var users = {};

users = addUser(users, {name: "mike", friend: "-"}, 'test1');

answered Apr 8, 2014 at 8:55

xdazz

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1 Comment

mdunisch Over a year ago

thank you. Is the necessary in javascript to check (L.2-4)? php would automatically set the array if it's not set before

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