how to insert array multidimensional javascript

Question

I have some arrays and I want to insert dynamic multidimension array

var multi = [];

var group = 'fruit';
var fruit_name = 'apple';

multi[group][fruit_name].push({'berbiji' : 'ya', 'panen' : '3tahun'});

why error like this "TypeError: multi[group] is undefined"

index can only integer in array

Mahi
– Mahi

2016-11-18 06:41:37 +00:00
Commented Nov 18, 2016 at 6:41 — Mahi
– Mahi, Commented Nov 18, 2016 at 6:41
Well that's a hash and not array.

Mritunjay
– Mritunjay

2016-11-18 06:42:04 +00:00
Commented Nov 18, 2016 at 6:42 — Mritunjay
– Mritunjay, Commented Nov 18, 2016 at 6:42

Jure Malovrh · Accepted Answer · 2016-11-18 06:46:22Z

4

You are trying to make array act like an object. If you want to make your code work, than you should write like:

var multi = {};
var group = 'fruit';
var fruit_name = 'apple';

multi[group] = {};
multi[group][fruit_name] = [];
multi[group][fruit_name].push({'berbiji' : 'ya', 'panen' : '3tahun'});

edited Nov 18, 2016 at 6:46

answered Nov 18, 2016 at 6:43

Jure Malovrh

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1 Comment

ridwan skaterocks Over a year ago

yes it is oonly example for my javascript project, iam adversity to solve this problem, and it's working!! thanks!

Hurelu · Accepted Answer · 2016-11-18 07:07:25Z

The names of the keys ('fruit' and 'apple') are not numbers so it is not a matrix (array of arrays) but a set of nested objects.

Nested Array (keys are numbers):

multiArray = [[
  {'berbiji' : 'ya', 'panen' : '3tahun'}]]
]]
multiArray[0][0].panen === '3tahun' // true

Nested Object (keys are strings):

multiObject = {
  fruit: {
    apple: {'berbiji' : 'ya', 'panen' : '3tahun'}
  }
}
multiArray[group][fruit_name].panen === '3tahun' // true

Either way, the nested object or array needs to be initiated before you can assign values to keys.

To follow your example:

var multi = {}
var group = 'fruit'
var fruit_name = 'apple';
multi[group] = {} // same as multi.fruit = {}
multi[group][fruit_name] = {'berbiji' : 'ya', 'panen' : '3tahun'}
multi.fruit.apple.panen === '3tahun' // true

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