Removing/Adding a specific variable from an object inside javascript array?

Question

I have a map array with objects stuffed with variables looking like this:

var map = [
[{ground:0, object:1}, {ground:0, item:2}, {ground:0, object:1, item:2}],
[{ground:0, object:1}, {ground:0, item:2}, {ground:0, object:1, item:2}]
];

Now I would like to be able to delete and add one of the variables like item:2.

1) What would I use to delete specific variables?

2) What would I use to add specific variables?

I just need 2 short lines of code, the rest like detecting if and where to execute I've figured out.

I've tried delete map[i][j].item; with no results.

Help appreciated.

I don't want to remove the entire object {ground:0, object:1}, I want to delete the property, variable, whatever it's called from inside the object that is the key. — justanotherhobbyist
– justanotherhobbyist, Commented Mar 21, 2012 at 19:28
Okej, I've tried that allready, but it doesn't delete it, the rest of the code to be executed at that moment works fine though. Got any clues what I might be doing wrong? — justanotherhobbyist
– justanotherhobbyist, Commented Mar 21, 2012 at 19:33
I imagine you're re-assigning the value somewhere else in the code, so by the time you get around to checking it, the value is back — Jimmy
– Jimmy, Commented Mar 21, 2012 at 19:35
Sorry I'm retarded, changed [i][j] to X and Y positions and it fixed it, change your post to an answer and you get free credit. =) — justanotherhobbyist
– justanotherhobbyist, Commented Mar 21, 2012 at 19:36

Jimmy · Accepted Answer · 2012-03-21 19:32:09Z

1

delete map[i][j].item should be what you need. Here's my test run in the Javascript console (Chrome)

> var map = [
    [{ground:0, object:1}, {ground:0, item:2}, {ground:0, object:1, item:2}],
    [{ground:0, object:1}, {ground:0, item:2}, {ground:0, object:1, item:2}]
  ];
  undefined

> map[0][1]
  Object
    ground: 0
    item: 2
    __proto__: Object

> delete map[0][1].item
  true

> map[0][1]
  Object
    ground: 0
    __proto__: Object

answered Mar 21, 2012 at 19:32

Jimmy

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2 Comments

justanotherhobbyist Over a year ago

While I got you here, whats the delete version to add something in the same way?

Jimmy Over a year ago

You're overthinking it. map[0][1].item = 2 if item doesn't already exist, it gets added.

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