How can I push an array into an object [duplicate]

Question

I'm looking for a way to push an array into an object.

Chek this out:

var playlists = {
  playlist01: [],
  playlist02: [],
  playlist03: []
};

Now I need to push a new array, named "playlist04", but I don't know the name, I have it in a var name.

Something like this: playlists.push($foo: []);

Can anyone help me?

Thank you and greetings!

the original question didn't get the answer either; even though they are similar the problem in this one is by far more specific and it's answer is definitely "no", i.e.: 'you can not!'. You can't use the array push method on Object, and you cannot extract the name of a variable. — Bekim Bacaj
– Bekim Bacaj, Commented May 6, 2016 at 21:21

Mike Cluck · Accepted Answer · 2016-05-06 21:02:39Z

5

You push things into arrays. You add properties to objects. It's as simple as this:

playlists.playlist04 = [];

Or if I'm interpreting your latter code correctly, like this:

playlists.playlist04 = $foo;

Or if you don't know the name that you want for the property but you have that name stored in a variable, you can use bracket notation:

playlists[$foo] = [];

answered May 6, 2016 at 20:57

Mike Cluck

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2 Comments

I think the property name is unknown in his case, might want to add code similar to Jerry's comment.

@IrkenInvader Good point. Added it.