splicing specific value in array of array

Question

I have an associative array stored in another associative array. I know how to splice a specific value in just a regular array as such:

arr.splice(arr.indexOf('specific'), 1);

I was wondering how one could splice an array such as this:

arr['hello']['world']

EDIT Would this shorten hello['world']['continent']

var hello = {};
            hello['world'] = {};
            hello['world']['continent'] = "country";
            delete hello['world']['continent'];
            alert(hello['world']['continent'])

What are hello and world? What does arr look like? What do you want it to look like? — gen_Eric
– gen_Eric, Commented Mar 7, 2012 at 19:48
arr['hello']['world'] can also be accessed as arr.hello.world — gen_Eric
– gen_Eric, Commented Mar 7, 2012 at 20:06

Community · Accepted Answer · 2017-05-23 10:24:24Z

2

You should be able to just just use the delete keyword.

delete arr["hello"]["world"]

How do I remove objects from a javascript associative array?

Edit, based on other comments:

For the sake of readability, you can also do:

delete arr.hello.world

Since we are really just talking about objects, and not traditional arrays, there is no array length. You can however delete a key from an object.

edited May 23, 2017 at 10:24

CommunityBot

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answered Mar 7, 2012 at 19:45

GoldenNewby

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8 Comments

re1man Over a year ago

would this shorten the array though?

GoldenNewby Over a year ago

It would remove the world object all together. So, it would shorten arr["hello"]

re1man Over a year ago

wouldn't it just make it undefined...im pretty sure

GoldenNewby Over a year ago

I was thinking of the length more in the context of listing the keys of the object. In that case I believe it would shorten the list of keys.

tamarintech Over a year ago

@Rocket The reason I put "shortens" in those quotes is exactly what you're suggesting... "shortens" doesn't make sense (exactly as you said). That's what I was trying to communicate. :)

|

max · Accepted Answer · 2012-03-07 20:01:04Z

1

JavaScript does not have associative arrays.

Use objects:

var x = {
  a : 1,
  b : 2,
  c : {
     a : []
  }
}

delete x.c.a;

answered Mar 7, 2012 at 20:01

max

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Comments

bhamlin · Accepted Answer · 2012-03-07 19:48:44Z

0

An "associative array" in javascript isn't actually an array, it's just an object that has properties set on it. Foo["Bar"] is the same thing as Foo.Bar. So you can't really talk about slicing or length here.

answered Mar 7, 2012 at 19:48

bhamlin

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